Why was natural selection difficult for Darwin to fully explain?
A) Natural selection tends to reduce variation.
B) Natural selection acts by removing only variants of the highest fitness.
C) Natural selection acts by removing only variants of the lowest fitness.
D) Natural selection does not actually remove any variants in real life.

Question

Quizplus · Accepted Answer

Natural selection reducing variation was difficult for Darwin to fully explain because it seemed to imply that over time, all organisms would become extremely similar to one another. However, there is still a vast amount of variation within species, and Darwin struggled to explain how this variation could be maintained in the face of natural selection.

Why Was Natural Selection Difficult for Darwin to Fully Explain