Question

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 the horse gradually 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? multiple choice artificial directional drift disruptive

Explanation:

In directional selection, the environment changes and the population evolves in a particular direction. Here, as the environment changed from forests to grasslands, horses gradually evolved from small - cat sized to the large modern horses. This is a directional change in the population's traits over time. Artificial selection is done by humans. Genetic drift is due to random changes in allele frequencies. Disruptive selection favors extreme phenotypes over intermediate ones.

Answer:

B. directional