Explanation:
Keystone species are animals that help manage other animal species by controlling population numbers and biodiversity within an ecosystem. The impacts of keystone species are usually greater than their numbers.
owls can be a great benefit to places where rodent populations are high. Dense urban areas often suffer from an abundance of rats and mice spreading disease, and rural agricultural communities have their crops consumed and soil eroded from burrowing voles and field mice. Without owls, and other top predators, rodent populations could explode and exacerbate the effects they produce.
Answer/Explanation:
Gene mutations are changes to the DNA sequence that arise by chance. These changes can cause the gene to have different functions. Usually, these functions are not beneficial - i.e. the mutation makes the gene work less efficiently or not at all.
However, on rare occasions, the altered gene function is advantageous, meaning it gives the organism a benefit for survival.
Mutations in the germ line are always passed on to the next generation, i.e. they are inherited. But if a mutation gives a selective advantage by helping survival, then that organism is more likely to survive to reproductive age and pass the mutation on.
The inheritance of this mutation and the selective pressures acting upon it are the driving forces of evolution.
The accumulation of mutations and the pressures of natural selection can affect different populations of the same species differently. For example, if one small population of birds migrates to an island with a different food source, then the selective pressures will be different than for their relatives on the mainland.
Over time, speciation will occur, and two new species will form. While they have a common ancestor, they are no longer the same species as evolution has caused them to diversify.
Answer:
Coumadin is prescribed for atrial fibrillation to thin the blood and prevent the formation of clots.
Explanation:
Atrial fibrillation is characterized by inadequate pumping of blood by the atria to the ventricle. Since,the atria are in a state of fibrillation or shaking, they cannot pump blood to the ventricles. This increases the risk of blood clots forming inside the atria that could potentially increase the risk of heart attack or stroke if the clots get lodged in the coronary or carotid arteries.
Coumadin is blood thinner that minimizes the aforementioned risks.
Mary has major depression, all of those actions are symptoms of major depression.
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