Most countries are expected to undergo a demographic transition at some point. Which of the following offers the best description of a typical demographic transition? High birth and death rates drop together. People have fever babies and live longer, but the population size doesn't change. High birth rate declines before high death rate declines. The population size drops rapidly and levels off when death rate once again equals birth rate. High death rate declines before high birth rate declines. The population size increases rapidly and levels off when birth rate once again equals death rate. Low birth and death rates increase dramatically, together or sequentially. The population size changes unpredictably for a while, eventually stabilizing.
Answers
Demographic transition refers to the process of population change over time. The term "demographic transition" refers to the transition from high birth and death rates to lower birth and death rates as a country or region urbanizes and becomes more industrialized.
Basically, in a typical demographic transition, the birth rate declines before the death rate declines, resulting in population growth.Stage of the demographic transition:Stage 1 - High StationaryIn this stage, the birth rate and death rate are both high, resulting in a low rate of population growth. Most societies were in this stage before the industrial revolution.Stage 2 - Early ExpandingThe birth rate remains high, but the death rate begins to fall due to advancements in healthcare and sanitation. Population growth is high in this stage because the birth rate is not decreasing significantly.
Stage 3 - Late ExpandingAs more families move to cities, the birth rate begins to decrease as a result of education and urbanization, while the death rate continues to decrease. Population growth slows down in this stage, but it is still substantial.Stage 4 - Low StationaryIn this stage, both the birth and death rates are low, resulting in very little population growth. Most Western countries are currently in this stage.Stage 5 - DecliningPopulation growth is negative in this stage because the death rate exceeds the birth rate. Countries in this stage are having a hard time supporting an aging population, and immigration becomes essential for maintaining population levels.
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Related Questions
complete the sentences describing the negative feedback loops between the hypothalamus, pituitary, and thyroid glands. answers in the word bank may be used more than once.
Answers
Negative feedback loops between the hypothalamus, pituitary, and thyroid glands help regulate the secretion of thyroid hormones.
When the levels of thyroid hormones (T3 and T4) in the blood decrease below a certain set point, the hypothalamus releases thyrotropin-releasing hormone (TRH). TRH then stimulates the anterior pituitary gland to secrete thyroid-stimulating hormone (TSH). TSH, in turn, acts on the thyroid gland to stimulate the synthesis and release of thyroid hormones.
Once the levels of thyroid hormones in the blood reach an optimal range, they exert inhibitory effects on both the hypothalamus and the anterior pituitary. Thyroid hormones directly inhibit the release of TRH from the hypothalamus and TSH from the anterior pituitary. This negative feedback inhibits further stimulation of the thyroid gland and helps maintain the thyroid hormone levels within a narrow range.
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Some one help please!! Im timed Will mark Brianlyest
Answers
Answer:
water table
Explanation:
brainliest pls.
Which body cavity has both anterior and posterior portions and houses many organs called viscera?.
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The ventral cavity has both anterior and posterior portions a d houses many organs called viscera.
Numerous distinct organ systems are housed in the ventral cavity, the area inside the front of the body. The term viscera also refers to the internal organs of the ventral cavity. The diaphragm, a strip of skeletal muscle located below the lungs, divides the ventral cavity into anterior and posterior sections.
An region of the body that is filled with fluid that houses and protects internal organs is known as a body cavity. The numerous bodily cavities in humans are separated by membranes and other structures. The two largest body cavities in humans are the dorsal cavity and the ventral cavity. Between these two body cavities are smaller bodily cavities. The thoracic and abdominopelvic cavities make up the ventral cavity. The cranial and spinal cavities are separated by the dorsal cavity.
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Over time, a wetland ecosystem loses much of its water.
What are the most likely effects of this change?
Wetland plants and animals adapt to drier conditions.
New plants and animals move into the ecosystem.
The area fills with decaying plant matter.
The climate changes so that precipitation increases, restoring the wetland.
Answers
Wetland ecological changes, adaptability, migration, decay, and potential restoration are all caused by water loss.
What is the ecosystem?A community of living and nonliving creatures that interact with one another in a particular setting is called an ecosystem. It is made up of abiotic (nonliving) elements like water, air, soil, and sunlight as well as biotic (living) elements like plants, animals, and microorganisms.
A wetland ecosystem might suffer substantial effects if it loses a lot of water over time. The wetland plants and animals that are suited to moist circumstances may struggle to live when the water levels drop and may perhaps go extinct. New plants and animals that are more suited to dry environments will consequently migrate in and occupy the ecosystem, possibly changing the wetland's richness and balance. The lack of water may also cause a buildup of decomposing plant matter, which can harm the ecosystem by lowering the quality of the water and reducing the resources available to other organisms.
This is not always the case, though, and the wetland may continue to deteriorate if other elements, including the effects of human activity, are also at play.
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Describe an abiotic characteristic that is similar in both the desert and the rainforest.
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Which of the following statements is true about arteries?
Arteries are large vessels.
Arteries carry blood from the heart to tissues of the body.
Arteries carry oxygen rich blood, with the exception of pulmonary arteries.
Arteries have thick walls which are needed to withstand pressure produced when the heart pushes blood into them.
None of the above
All of the above
Answers
Answer:
All of the above
Explanation:
which of the following ecological roles is/are played by at least some fungi? select all that apply. which of the following ecological roles is/are played by at least some fungi?select all that apply. autotrophy predation decomposition
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Some fungi play the following ecological roles: Predation, Decomposition. Thus, the correct option is "B and C".
Autotrophy: the ability of an organism to produce its own food from simple inorganic substances like water and carbon dioxide is known as Autotrophy.
For example, Green plants use the energy of the sun to convert carbon dioxide and water into glucose in photosynthesis, thereby producing food for themselves. Fungi are not autotrophic.
Predation: fungi act as decomposers, and many of them help in the decomposition of dead plants and animals. Some fungi that are parasitic on plants and animals are predators. They secrete enzymes that break down the cell wall of the host cells, allowing them to enter and suck out nutrients. For example, the fungus Ophiocordyceps infects ants, takes over their nervous system, and makes them climb up to a high place where they die, enabling the fungus to spread its spores.
Decomposition: fungi play a crucial role in the ecosystem as decomposers, breaking down dead plant and animal material and returning nutrients to the soil. Without decomposers like fungi, dead organic matter would accumulate in the environment and nutrients would not be recycled. Fungi are the primary decomposers of dead organic matter in most ecosystems.
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The depth of water was____ feet at its highest level.
Answers
Answer:
1200ft
Explanation:
depth of water ranges from 0ft below the surface along major rivers and streams to a maximum estimated at more than 1200 ft below land surface on the southern slops oflarch mountain
Are blue-green algae plants?
Blue-green algae are colored prokaryotes that can be
unicellular or can form colonies of cells, but they are not
truly multicellular. This algae species is autotrophic,
needs sunlight, and performs photosynthesis.
O yes, because they are not multicellular or eukaryotic
O yes, because they are autotrophic and need sunlight
O no, because they are autotrophic and need sunlight
O no, because they are not multicellular or eukaryotic
Answers
Answer:
Explanation:
d
Which of the following does not explain the importance of mangrove forests? a. They provide shelter to organisms on high energy coasts. b. They help prevent erosion along coasts. c. They increase surface runoff and flooding. d. They filter and process pollutants out of the environment.
There's no science one???? So we went with biology
Answers
Answer:
The correct option is C.
Explanation:
Mangrove forest serves as habitat for a large number of water animals such as molluscs, crabs, fish, etc. Mangrove helps in stabilizing coast line, it protect the ecosystem from storms, it stores high amount of carbon and many animals lived in various habitat in the ecosystem. Mangrove forest does not increase surface run off and flooding rather it prevent it.
Answer: its C
Explanation: They increase surface runoff and flooding.
It is impossible for sperm to be functional (able to fertilize the egg) until after ________. Group of answer choices
Answers
Answer:
The answer is "they undergo capacitation"
Explanation:
Sperm migrate through uterine contractions and the energies of its flagella to the uterine tube. In sperm motility, reverse peristalsis is engaged in the uterus and uterine tubes. For a sperm cell to fertilize an egg, it takes approximately 24 hours. The surface of the egg changes as the sperm penetrates the egg, therefore no sperm is allowed within. The kid is fully genetic, including whether it's a boy or a girl at the time of fertilization. Until they are trained it is difficult for sperm to be working.
8. Which of these is not a possible effect of the destruction of the
rain forest?
O A. drought
O B. crop failure
O c. more oxygen in the air
O D. increase in carbon dioxide in air
Answers
Answer:
drought
Explanation:
droughts are bad for the rain forests without water some plants can die
What do ATP and Glucose have in common?
Answers
Answer:
They are both chemical sources of energy. If you want a difference between the two, it is that they have differnen chemical structure. Glucose is made from carbon, hydrogen, and oxygen while ATP is made ribose, a five-carbon sugar, three phosphate groups, and adenine , a nitrogen-containing compound (also known as a nitrogenous base).
ATP (adenosine triphosphate) and glucose are both important molecules involved in the production of energy in cells.
What is glucose?Glucose is a simple sugar that provides a significant source of energy to cells. It is broken down through a series of chemical reactions in a process known as cellular respiration, which results in the production of ATP.
During cellular respiration, glucose is oxidised and the energy released is used to power ATP synthesis.
In turn, ATP provides energy for a variety of cellular processes such as muscle contraction, protein synthesis, and cell division.
As a result, both ATP and glucose are required for cell energy metabolism.
Glucose is the primary fuel source for ATP synthesis, and ATP is the energy currency of cells, providing the energy required for various cellular processes.
Thus, this way, ATP and Glucose have many things in common.
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The sequence of nucleotides below is present at a DNA location where the chain opens to form a replication fork: 3' CCTAGGCTGCAATCC 5' An RNA primer is formed starting at the underlined T () of the template. Which of the following represents the primer sequence? OA) 5'AGCCTAG G3 B) 5'AGCCUAG G3 C) 5'ACGTTAG G3 D) 5' ACGUUAG G3
Answers
The sequence of nucleotides that represents the primer sequence is 5' ACGUUAGG3'.
A primer for RNA is added. In RNA, U's are found where T's would typically be. The template strand is complementary to the RNA primer. T and U are complementary to A, but C and G are mutually exclusive. The complementary primer for the template strand from the second T from the 3' end is 5'-ACGUUAGG-3'.
A primer is a short nucleic acid sequence that acts as the starting point for the production of DNA. Primers are made of short RNA strands in living things. Primase, a subtype of RNA polymerase, is an enzyme that produces a primer before DNA replication can occur.
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How Is the Nature of the Geologic Activity That Is Observed Near a Plate Boundary Related to the Type of Plate Interaction That Occurs at That Boundary?
Answers
Female and male mealworms both contain twenty diploid chromosomes, but males have one smaller chromosome than in females. What can be inferred from this observation?.
Answers
Further investigation into the genetic and molecular basis of this sex chromosome system could provide insights into the mechanisms of sex determination in mealworms.mechanisms of sex determination .
From the observation that female and male mealworms both contain twenty diploid chromosomes, but males have one smaller chromosome than females, it can be inferred that the smaller chromosome in males likely determines their sex. This difference in chromosome size indicates the presence of a sex chromosome system in mealworms. In many organisms, including insects, sex determination is often controlled by sex chromosomes. The presence of a distinct, smaller chromosome in males suggests that it carries the genes responsible for male-specific traits and plays a role in determining the male sex.
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Research indicates that dreaming may be responsible for inspiring creativity by __________. a. stimulating beta waves, which are responsible for waking brain activity b. rehearsing the daily activities for which one may need preparation c. allowing for the emergence of old data in useful, new patterns d. giving the brain long periods of rest where it is not overworked please select the best answer from the choices provided a b c d
Answers
Answer: c. allowing for the emergence of old data in useful, new patterns
robert whittaker's study of plant variation in the great smoky mountains showed that different tree species achieved their greatest abundances at different moisture levels. this suggests that
Answers
In the Great Smoky Mountains, Robert Whittaker's study of plant variation revealed that various tree species thrived at various moisture levels. This implies that species are autonomous.
A species cannot survive by itself. To thrive, all life requires other life. Flowers on plants have evolved characteristics that encourage pollination by specific species. In turn, pollinator species have developed characteristics that make it easier for them to collect pollen or nectar from particular types of flowers. The association is advantageous to both the flowering plants and the pollinators, such as birds or insects. An illustration of a symbiotic relationship is this. All living things rely on their surroundings to provide them with the necessities, such as food, water, and shelter. Physical elements in their environment include things like soil, air, water , temperature and other organisms.
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What is the main body system affected from sickle cell anemia?
Answers
Cancer is marked by uncontrolled cell growth and division. Which factor in excessive amounts contributes to this development
Answers
Answer:
Uncontrolled Meiosis is the correct answer for your question. Cancer: Cancer is a non-infectious, deadly disease that results in the uncontrolled growth of the tumor cells or cancer cells.
Explanation:
i hope that helps
Which statement about bacteria is true?
O Bacteria are always harmful.
O Bacteria are large organisms.
O Bacteria are not successful and are becoming endangered.
O There are more bacteria in the world than all other organisms.
Answers
Answer:
the last choice is the answer
{there are more bacteria in the world than all other organisms}
• there are more bacteria in the world than all other organisms.
to discover the location of a genetic mutation that causes a specific disease in humans, scientists use genetic mapping. specifically, they look for genetic markers, or previously discovered dna polymorphisms, that show statistical association with the occurrence of the disease. what does the statistical association mean?
Answers
In the context of genetic mapping and disease in humans, "statistical association" refers to the observed relationship between genetic markers (DNA polymorphisms) and the occurrence of a specific disease caused by a genetic mutation. A strong statistical association indicates that the presence of a particular genetic marker is more likely to be found in individuals with the disease, suggesting that the marker is linked to the genetic mutation responsible for the disease.
The statistical association in genetic mapping refers to the observation of a correlation between the presence of a particular genetic marker and the occurrence of a specific disease in humans. This means that individuals who have the genetic marker are more likely to develop the disease than those who do not have the marker. However, it is important to note that statistical association does not necessarily mean causation, and further research is needed to confirm the actual causative genetic mutation responsible for the disease.
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What do you think you would see if you could look inside the cell of an organism? What structures do you think you might observe?
Answers
Answer: a bunch of organelles
Explanation:
some examples are...
mitochondria
cell wall
cell membrane
nucleus
Order the elements from smallest to largest atomic number.
Answers
Answer:
The following is the arrangement of the given elements from smallest to largest atomic number:
Nitrogen (N), Sodium (Na), Chlorine (Cl), Copper (Cu), Rubidium (Ru),
Silver (Ag), Iridium (Ir).
Explanation:
What is the atomic number?
The atomic number of an element is defined as the number of protons present in its nucleus, or the number of electrons present in its ground state (neutral state).It is represented by the letter Z. Z= number of protons in the nucleus of one atom of the element.Atomic number of chlorine (Cl) = 17
Atomic number of copper (Cu) = 29
Atomic number of iridium (Ir) = 77
Atomic number of nitrogen (N) = 7
Atomic number of rubidium (Ru) = 37
Atomic number of silver (Ag) = 47
Atomic number of sodium (Na) = 11.
Thus, arranging from the lowest to the highest atomic number, the order is: nitrogen, sodium, chlorine, copper, rubidium, silver, iridium.
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Which of the following associations is NOT correct?
1) amphetamines-narcolepsy
2) methamphetamine-ADHD
3) opioids-pain
4) benzodiazepines-anxiety
Answers
The association which is not correct is methamphetamine-ADHD (Option 2).
What is methamphetamine?Methamphetamine is a stimulant drug that is illegal. Methamphetamine, like amphetamines, can be prescribed to treat ADHD. Methamphetamine, unlike amphetamines, has a high potential for addiction and misuse.
Opioids are a type of pain medication. Opioids can be prescribed for acute pain (short-term pain, such as that experienced after surgery) as well as chronic pain (long-term pain that is not resolved by other treatments). Benzodiazepines are a class of drugs that are used to treat anxiety and other conditions that cause nervousness. While benzodiazepines can be helpful for some people, they also have a high potential for addiction and abuse. They should only be taken as prescribed by a doctor.
Thus, the correct option is 2.
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The signaling mechanism in which a cell contacts another cell through small junctions that connect the two cell membranes is called _____ signaling.
Answers
The signaling mechanism in which a cell contacts another cell through small junctions that connect the two cell membranes is called "contact-dependent" signaling. It involves the interaction of transmembrane receptors on the surface of adjacent cells.
Contact-dependent signaling is a way of communication that involves two cells physically touching each other.The signaling cell releases a signal molecule or ligand, which is then received by the membrane receptor of the receiving cell. The signal molecule triggers a cellular response, such as the activation of intracellular signaling pathways or gene expression changes.Contact-dependent signaling is important in the development of multicellular organisms. It allows for direct communication between cells and is essential for the proper development and functioning of organs and tissues.Contact-dependent signaling is different from other types of cell signaling, such as paracrine, autocrine, and endocrine signaling. In paracrine signaling, cells release signal molecules that diffuse through the extracellular fluid to nearby cells. In autocrine signaling, a cell releases a signal molecule that binds to receptors on the same cell. In endocrine signaling, cells release signal molecules that travel through the bloodstream to distant target cells.
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Sucrose is made of which simple sugars?
glucose and fructose
fructose and galactose
galactose and cellulose
cellulose and glucose
Answers
Answer:
it is made of
glucose and fructose.
Sucrose is made up of simple sugars glucose and fructose. Thus, the correct option is A.
What are Simple sugars?Simple sugars may be defined as carbohydrates in their most basic form. Such types of carbohydrates contain only one to two sugar molecules and are digested quickly.
Monosaccharides and disaccharides are examples of simple sugars. Examples of simple sugars are glucose, fructose, and galactose.
Therefore, Sucrose is made up of simple sugars glucose and fructose. Thus, the correct option is A.
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In the diagram below, images 1 and 2 represent the chemical and molecular levels of organization. Based on the levels of organization, what does image 4 represent? A diagram with 7 parts. 1, An atomic model. 2, A molecule. 3, A small group of cells. 4, A group of cells creating layers. 5, The heart. 6, The circulatory system. 7, A cat. tissue cell organ system organ
Answers
Image 4 in the diagram represents the tissue level of organization. Tissues are groups of similar cells that work together to perform a specific function. In image 3, we can see a small group of cells, which may represent a tissue at a very small scale. However, in image 4, we can see a larger group of cells creating layers, which is a characteristic of a tissue.
In higher levels of organization, tissues combine to form organs, and organs combine to form organ systems. For example, the heart is an organ that is part of the circulatory system. The circulatory system is an organ system that is responsible for the transportation of blood throughout the body.
Lastly, image 7 in the diagram represents the organism level of organization, which is the highest level of organization. At this level, all of the organ systems work together to maintain the functions of the entire organism, which in this case is a cat. Overall, the diagram shows the different levels of organization in living organisms, starting from the smallest unit of matter (atoms) to the largest scale of organization (organisms).
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suppose the dna of a gene contains seven regions, a through g, in that order. regions a, b, e, and g are located in exons, while regions c, d, and f are located in introns. what is the order of the regions in the mature mrna transcribed from that sequence?
Answers
The order of sequence of motifs in mature mRNA transcribed will be A, B, E, and G.
The order of mature mRNA transcribed would be as found accordingly with the arrangement of coding regions or exons which are A, B, E &G as given. Introns, a non-coding segment, contain C, D, and F. These sections are transcribed into pre-mature mRNA, but they are eliminated during the RNA splicing process to create mature mRNA, which only contains coding regions.
Introns are cut out during RNA splicing, which also cuts off intron motifs and joins exons so that C, D, and F are not transcribed since they are spliced due to non-coding segments. The section of a gene's DNA or RNA that codes for a protein are known as the coding region of a gene (CDR), sometimes known as the coding sequence (CDS). The exons are the segments of coding. The intronic sequences are non-coding sequences.
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*Please Help* How does introducing a new species to an ecosystem or losing an entire population can impact the ecosystem?
Answers
Answer:
The ecosytsem has a very fine balance. Each species is dependant on one another for food and population control. Introducing a new species such as the Cane Toad which has been introduced into Australia and Flordia and are extrmely invasive completly wipping out populations of Native species and are a huge problem. If you lose a population such as the wolves in yellow stone species such as elk will actually suffer from starvation and other issues due to lack of food etc because the wolves were not there for population control. But in some cases such as the wolves who were added back into Yellow stone it had a huge positive impact on species/populations.
Explanation: