A physical trait favored by an environmental change can be called an

The special niche occupied by a particular species is called a

Natural Selection is driven by a change in the environment and survival of the

Average phenotypes are favored in the environment, while extremes have lower survival rates.

Two populations of the same species are separated by land barriers like rivers or mountains.

Two populations of the same species do not have the same mating rituals or signals.

All the possible gene combinations in a population.

The frequency that single genes (alleles) for a trait appear in a population.

Changes in the gene pool over time.

Organisms of the same species do not interbreed for various reasons.

Isolated small populations speed up genetic drift.

Organisms of the same species can no longer interbreed therefore creating two species.

Severe population reduction reduces the gene pool

and increases the rate of genetic drift. Woolly mammoths became extinct. Elephants survived.

The extreme population phenotypes are favored by the environment.