Which Observation Would Pose the Greatest Challenge for Applying a Morphological

Question

Which observation would pose the greatest challenge for applying a morphological species concept?
A) Lack of sexual reproduction in a population
B) Populations separated by geographic distance
C) Populations that cannot be bred in the lab
D) Sexual dimorphism
E) Fossils separated by time

Accepted Answer

Sexual dimorphism can make it difficult to distinguish between species based solely on morphology, as males and females of the same species may look very different.