4. (3 pts) What is extinction7 Please explain the differences between mass extin

Question

4. (3 pts) What is extinction7 Please explain the differences between mass extinctions and background extinctions. Are mass extinctions homogenous in their effect or in their Cause? What characteristics of organisms appear to have been selected for that allows them to survive mass extinction events. What characteristics of organisms appear to have been selected for that allows them to survive backgrounds extinctions7 Do you accept the hypothesis that a mass extinction is currently underway? Why or why not?

Explanation / Answer

The dying out or the disappearance of a species is known as extinction.

In background extinctions, the species disappears on its own. It is natural selection and the species was not able to live in the environment. In mass extinction, about 50% of the species are wiped out.

Mass extinctions are not homogenous in their effect or cause.

Some traits that can make species more likely to survive are:

In background extinctions, natural selection removes the species which cannot adapt to changing environments. The species which can adapt easily to changes in temperature, food sources, changes in environment, changes in enemies are all selected.

Yes, a mass extinction is expected. The reasons are the high increase of pollution, global warming, meteors, megavolcanoes, sun heating up etc.

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