Answer:
Life expectancy has steadily risen.
People live longer lives.
To understand the reasons why the number of people in the world has increased and the population growth rate has decreased, it is necessary to understand how the world's demographic growth rate is calculated.
The calculation is made from the balance between the total number of people alive and the total number of deaths that occurred in a period of time.
Therefore, we can understand that the population growth rate has decreased due to several relevant factors, such as:
Increased life expectancy.The decrease in infant mortality.Rising fertility rates.Urbanization.Economic development.These are some of the reasons that help us understand why population numbers increase and population growth rate decreases.
Economic development, new technologies and a better quality of life for the population are directly related to the decrease in the population growth rate.
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Explain how fluctuations in abiotic cycles can influence populations.
Answer:
Populations are influenced by fluctuations in any of the abiotic cycles. The fluctuation of seasonal cycles can cause populations to hibernate, migrate, or breed. Organisms hibernate as a result of seasonal fluctuations that cause them to have a limited resource supply.
Given their size and complexity, biological molecules such as carbohydrates, proteins, lipids, and nucleic acids can also be referred to as ____________.
Answer:
This question lacks options, the options are;
A. Enlarged molecules
B. Macromolecules
C. Inorganic molecules
The answer is B
Explanation:
As mentioned in this question, carbohydrates, proteins, lipids, and nucleic acids are the basic biomolecules found in nature. They are all polymeric substances, hence, are made up of smaller units called monomers.
Asides from being biomolecules, these four molecules are also referred to as MACROMOLECULES based on their large size and complex nature. Macromolecules are molecules that are relatively large in size composing of an aggregate of monomer. Hence, these biomolecules are macromolecules.
A man cannot be a carrier for hemophilia. Why?
Answer:
This means that males only have one copy of most of the genes on the X chromosome, whereas females have 2 copies. Thus, males can have a disease like hemophilia if they inherit an affected X chromosome that has a mutation in either the factor VIII or factor IX gene.
What is Science ???.........
Answer↷
Science, any system of knowledge that is concerned with the physical world and its phenomena and that entails unbiased observations and systematic experimentation. In general, a science involves a pursuit of knowledge covering general truths or the operations of fundamental laws.
➦I hope it seemed helpful to you!
Answer:
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A Scientist discovers a chemical that she thinks might be a potential treatment for a certain type of cancer cell. In order to test her hypothesis, the scientist treats one plate of cancerous cells with the newly discovered chemical, and leaves another plate of cancerous cells untreated. After 7 days, the scientist measures the number of living cells in each plate. The scientist finds that the cells treated with the chemical have a lower survival rate than cells left untreated. The scientist further observes that the substance has an effect on the Rough endoplasmic reticulum (RER). How might disabling the rough ER potentially hurt the cancerous cells? Be specific in your answer. What is the dependent variable? What is the independent variable?
Answer:
Affecting the ER causes alteration in cell homeostasis and eventual death.Independent variable: Drug or chemicalDependent variable: Cancer cells survival.Explanation:
Hypothesis ⇒ A chemical ⇒ might be a potential treatment for cancer cells.
Experiment:
Treated ⇒ One plate of cancerous cells with the new chemicalUntreated ⇒ Another plate of cancerous cells with no chemical7 days later ⇒ the number of cells in each plate
Results:
Cells treated with the chemical have a lower survival rate than cells left untreated.
Treated plate ⇒ fewer cellsUntreated plate ⇒ more cellsChemical affects the Rough endoplasmic reticulum (RER)
----------------------------------------------------------------------------------------------------------
The endoplasmic reticulum is in charge of many cellular functions, such as protein folding, maturation, and transport, especially those destined for secretion. It produces the latest protein modifications after transduction.
When the synthesizing protein gets in the Rough endoplasmic reticulum, it continues its building in the organelle. Finally, the protein suffers folding and the initial stages of glycosylation.
Once the protein synthesis in the endoplasmic reticulum is over, these molecules are packaged into vesicles and sent to the Golgi complex for their final association with carbohydrates. Finally, protein leaves the Golgi complex and goes to its final destiny.
Any alteration in the intracellular environment
inevitably affects the organelle and its functions. When the organelle is not properly working, proteins synthesis is affected and, consequently, all the cellular activities. The affected cell homeostasis might be so altered that the cell ends dying.
If the drug affects the ER by altering its environment or directly affecting it, the organelle will fail to perform its functions, and the cell will eventually dye.
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The independent and the dependent variables are the two principal factors needed in an experiment.
Independent variable: Refers to all the variables in an experiment that provoke a response in another variable. The independent variable changes or is controlled and modified in the experiment to analyze how another variable responds to it. It changes to analyze its effects on the dependent variable. Usually, the independent variable is represented by the X letter.
In the exposed example, the independent variable is the drug that affects the cancer cells. The researcher decides to apply it or not, and the concentrations in which the drug is.
Dependent variable: Refers to the variable that reacts to the changes produced in the independent variable. Depending on how the independent variable is modified, the dependent variable change. It is usually identified by the letter Y.
In the exposed example cell survival is the dependent variable. Cancer cells respond to the presence/absence of the chemical, and might differently respond to the varying concentration of the drug.
Describe your environment
Answer:
Answer to the following question is as follows
Explanation:
The term "environment" refers to everything that surrounds us. It might be living creatures (biotic) or non-living objects (abiotic). Mechanical, biochemical, and other forces of nature are all part of it. ... Animals, vegetation, soil, water, and other moving and non-living objects interact in various ways in the surroundings.
What is one way a mountain might form?
A. Ocean wave force
B. Gravitational pull
C. Glacier movement
D. Volcanic activity
(A p e x)
Answer:
D.) Volcanic Activity
Explanation:
Excision of a whole organ or mass without cutting into it as seen in the HoLEP procedure to treat BPH, is called
Answer:
enucleation po ^-^
Explanation:
ata? correct me if imma wrong -¿-
which best describes a difference between transcription and dna replication
write a report on storm around the world
MCQ ...help me........It's a last question
The theory of natural selection states that
Answer:
Natural selection is a mechanism of evolution. Organisms that are more adapted to their environment are more likely to survive and pass on the genes that aided their success. This process causes species to change and diverge over time.
Explanation:
How does evolution explain both the unity and the diversity of all living things?
Answer:
Having a similar dna makeup as one animal but our features and genetic makeup different than that one animal.
Explanation:
There is unity in having the same dna as one animal but diversity in our features
The last common ancestor of all animals was probably a(n) The last common ancestor of all animals was probably a(n) algae. chytrid. yeast. protist. fungus.
Answer:
The correct answer is - protist.
Explanation:
Protist is a single-celled eukaryote that contains organelles. It is the last common ancestor of all animals as is consider as most primitive animal cells as it has no cell wall but contains the nucleus and other double-membrane organelles. The protists are the cell that distinguishes fungus, plant cells, and animal cells into these three different kingdoms.
Thus, the correct answer is - protist.
What is a variegated leaf
Answer:
The term, "variegated" is applied to a flower or, more often, a leaf that has more than one color. Most often, it will be two-toned (that is, bi-colored). Often this will mean the foliage is blotched, striped, or bordered with a lighter color than that on the rest of it (or vice versa). The term is also applied more broadly to a whole plant that bears such leaves or blossoms. The corresponding noun for this definition is "variegation."
what do you think the most important property of life is and why
Answer:
i think discovery
because people are curious
and curiosity is an important reason to live
no one wants to live in vain
Greetings from Turkey
Explanation:
GOOD LUCK ツ
Answer:
Water
Water is life. Without water, we would be dehydrated and our body would not perform well.
After nervous stimulation stops, calcium ions returning to the sarcoplasmic reticulum prevent ACh in the synaptic cleft from continuing to stimulate contraction True False
Answer:
False.
Explanation:
Neurotransmitter release occurs from the nervous terminal or varicosities in the neuronal axon. When an action potential reaches the nervous terminal, the neurotransmitter is released by exocytose. The molecule binds to its receptor in the postsynaptic neuron, triggering an answer. As long as the signal molecule is in the synaptic space, it keeps linking to its receptor and causing a postsynaptic response. To stop this process the neurotransmitter must be taken out from the synaptic space. There are two mechanisms by which the neurotransmitter can be eliminated:
• Enzymatic degradation/deactivation: There are specific enzymes in the synaptic space, which are in charge of inactivating the neurotransmitter by breaking or degrading it. The enzyme acetylcholinesterase prevents ACh from continuing to stimulate contraction.
• Reuptake: Receptors located in the presynaptic membrane can capture de molecule to store it back in new vesicles for posterior use. These transporters are active transport proteins that easily recognize the neurotransmitter.
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Photosynthesis is a chemical reaction that takes place inside a plant, producing food for the plant to survive.Carbon dioxide, water and light are all needed for photosynthesis to take place.Photosynthesis happens in the leaves of a plant.
Which type of selection is also known as diversifying selection because it tends to favor the survival of two or more different phenotypes in a heterogeneous environment
Answer:
Disruptive selection.
Explanation:
Disruptive selection is also called diversifying selection because it favor the survival of two or more different types of phenotypes in a particular environment. Disruptive selection describes changes in population in which extreme values for a trait are favored whereas the intermediate values are less favored. Due to the increase the variance of the trait which leads to the division of population into two distinct groups.
Which of the following factors affecting population growth is density
independent?
A. Competition
B. Disease
C. Natural disaster
D. Predation
C. Natural disaster is a density-independent factor affecting population growth. Density-independent factors are those that affect the population irrespective of the population size or density.
How Natural disasters reduce population sizes?Natural disasters such as floods, hurricanes, earthquakes, and wildfires can reduce population sizes regardless of how many individuals were present in the population before the disaster occurred. The other factors listed - competition, disease, and predation - are all density-dependent factors, which means that they become more significant as the population size or density increases.
Competition is an example of a density-dependent factor, as it increases as the population size increases. As more individuals compete for limited resources such as food, water, and shelter, the rate of population growth slows down.
Disease is another density-dependent factor, as it spreads more easily in crowded populations where individuals are in close contact with one another.
On the other hand, natural disasters such as floods, hurricanes, and wildfires are examples of density-independent factors. These events can affect a population regardless of its size, and they can cause significant decreases in population size.
Predation can be both a density-dependent and density-independent factor. In some cases, predation can increase as the population size increases, making it a density-dependent factor. However, predators can also reduce the population size through random hunting or selective hunting of weaker individuals, making it a density-independent factor.
Understanding the factors that affect population growth is important for predicting and managing population sizes in both natural and human-made ecosystems.
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Based on the Punnett square, what is the phenotype of the offspring? Hh HH tall short Mark this and return
Answer:
tall
Explanation:
I took the test
What is the name of the strategy that combines two plant proteins (grains and beans) to get all the essential amino acids
Answer:
Protein combining
Explanation:
The strategy involving the combination of two plant proteins to get all the essential amino acids is referred to as protein combining.
The practice of protein combining is common among vegans due to the general belief that a single plant-based protein does not contain all the necessary amino acids for the body. Thus, one would need to combine 2 plant-based proteins in order to get all the essential amino acids for adequate health.
When cutting a stem, you can cut straight across, not at an angle *
True
False
The role played by the systems of the body in ensuring survival of farm animals in hot and dry climates
Answer:
Answer to the following question is as follows;
Explanation:
Domesticated animals have a natural instinct to seek out cover and seek refuge from the scorching heat. Their bodies, on the other hand, have inherent defensive systems to help them cope with heat and dryness. One of these is their covering or fur, which gives sun protection.
Animals living in hot, dry climates consume a lot of water, which is subsequently stored in their tissues to keep them from becoming dehydrated. Sweating is accomplished by certain animals by keeping their mouths open.
Use the drop-down menus to complete each sentence. occurs when the immune system attacks the body. is often caused by obesity resulting from overeating and poor nutrition. is caused by DNA changes in a single gene and affects the nerve cells in the brain. is caused by uncontrolled cell growth. occurs when the pancreas does not produce enough insulin, or the body does not respond properly to it.
Answer:
The correct answer is -
1. Lupus
2 Cardiovascular disease
3. Huntingtons disease
4. Cancer
5. Diabetes
Explanation:
Lupus is one of the autoimmune diseases that takes place when our bodywork against ourself and harm cells and skin. When an individual has poor or bad nutrition and generally experiences obesity this cardiovascular disease occurs.
Huntington's disease takes place due to changes in DNA in the brain and affects neurons of the brain. Cancer is uncontrollable cell growth that can be lethal. If an individual is not able to produce enough amount of insulin, that lowers the glucose from the blood, will lead to cell diabetes condition
In the dihybrid cross,
of the parents had black fur and black eyes.
The offspring
.
Answer: The offspring can have both 100% black fur and eyes or it can vary
In the dihybrid cross,
✔ both
of the parents had black fur and black eyes.
The offspring
✔ varied.
-
The predicted values for the four phenotypes form a
✔ 9:3:3:1
ratio. The simulated values
✔ approximately
match this predicted ratio.
On Edge.
do thyroid hormones influence heart rate from influencing the heart itself, or the attached to it?
Answer:
An excess of thyroid hormones increases cardiac contractility and resting heart rate (see box below). Cardiac output may increase by 50-300 per cent as a result of the combined effect of increases in resting heart rate, contractility, ejection fraction and blood volume, with a concomitant decrease in SVR.
what lead to the growth of most sea weeds in lakes . please help
Answer:
The more turbid the water, the warmer the water will be, allowing algae to grow quickly. As algae forms, the water becomes increasingly turbid, which fosters an even stronger environment for algal blooms to thrive.
Answer:
carbon and organic substance
Explanation:
when animals are dead under the sea /or when some other substance under go the process of decomposition they produce carbon and some nutrients hence support plants growth
Water evaporates from a lake. Arrange the next steps of the water cycle in the correct order.
Water vapor condenses to form clouds.
Water flows down mountains and hills.
Water falls as rain, snow, and sleet.
Water joins streams or forms
groundwater
Answer:
1. Water evaporates from a lake
2. Water vapor condenses to form clouds
3. water falls as rain, snow, and sleet.
4. water flows down mountain and hills
5. water joins streams or forms ground water
Repeating cycle
Down syndrome is a genetic disorder that is also called trisomy 21. A person with Down Syndrome has an extra copy of chromosome 21. What can you infer is most likely the genetic mutation that results in Down syndrome?
A: Nondisjunction during meiosis
B: Complete duplication of chromosomes during polyploidy
C: Translocation during genetic replication
D: Crossing over during meiosis
Answer:
A : Nondisjunction during meiosis
Answer:
Nondisjunction during meiosis, resulting in uneven distribution of chromosomes
Explanation:
I took the test and got it right good luck!
