According to the theory of common descent, each species on Earth today should
A) look very similar to all other species.
B) not have ancestors in common with members of other species.
C) have a single ancestor in common.
D) have DNA that is mostly unique from other species.

Question

Quizplus · Accepted Answer

The theory of common descent suggests that all living organisms on Earth share a single common ancestor, meaning that all species have a common origin. Therefore, option C is the best choice as it directly reflects this concept. Options A, B, and D are incorrect, as they do not accurately reflect the theory of common descent. Species are actually diverse and can look very different from one another, and they can have ancestors in common with other species. Additionally, although different species have differences in their DNA, the theory of common descent suggests that all species share a significant amount of genetic material due to their common ancestry.

According to the Theory of Common Descent, Each Species on Earth