Question

four million years ago, horses were rather small compared to today’s horses, and had relatively stocky bodies with a straight shoulder and thick neck. this statement is an example of which biological concept?
homeostasis
reproduction
metabolism
evolution
development

Explanation:

The statement shows how horses have changed in size and body - structure over a long period of time. Evolution is the process of change in all forms of life over generations.

Answer:

D. evolution