According to the Theory of Common Descent, How Should Each

Question

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

Accepted Answer

According to the theory of common descent, all species on Earth today should have a single ancestor in common, meaning they share a common evolutionary history. This means that they may have similarities in their genetic code and physical characteristics, but also have unique adaptations that have arisen through natural selection. Therefore, choice C is the most accurate.