Over the course of millions of years various environments have changed. As grasslands slowly took the place of forests the inhabitants were forced to adapt or they went extinct. During this time period the horse evolved from a small cat sized creature to the size of the modern horses we see today. This is an example of which type of natural selection?
A) directional
B) disruptive
C) stabilizing
D) The horse did not undergo any type of Natural Selection during the course of its evolution.
E) The horse has not been on the Earth for millions of years.

Question

Quizplus · Accepted Answer

The evolution of the horse from a small cat-sized creature to the size of modern horses is an example of directional natural selection. This is because the changing environment favored larger body size which allowed the horses to better adapt and survive in the new grassland habitats.

Over the Course of Millions of Years Various Environments Have