Question

the diagram below shows the changes over time in the anatomy of horse - like organisms to the modern - day horse. which concept is best illustrated by the physical variations in the horse as its body size and structures changed over time? punctuated equilibrium over two generations artificial selection acquired characteristics gradual adaptation over successive generations

Explanation:

The changes in horse - like organisms to the modern - day horse over time in body size and structures are a result of gradual adaptation in response to environmental pressures across successive generations. Punctuated equilibrium involves long periods of stasis with rapid bursts of change, which is not indicated here. Artificial selection is human - driven, and there's no indication of human influence. Acquired characteristics are not passed on in the way described for the horse's evolution.

Answer:

Gradual adaptation over successive generations