The existence of evolutionary trends, such as increasing body sizes among horse species, is evidence that ________.

Question

Quizplus · Accepted Answer

Evolutionary trends, such as increasing body sizes among horse species, likely result from similar adaptations being beneficial to multiple species in particular environments. This does not necessarily indicate that evolution generally progresses toward a goal, or that evolution tends toward increased complexity or size. However, a larger volume-to-surface area ratio may indeed be adaptive in many mammals.

The Existence of Evolutionary Trends, Such as Increasing Body Sizes