By the mid-twentieth century, the causes of evolution were seen as all of the following except
A)natural selection.
B)macromutation.
C)gene flow.
D)genetic drift.

Question

Quizplus · Accepted Answer

By the mid-twentieth century, the causes of evolution were believed to be natural selection, gene flow, genetic drift, and mutation (including small changes in DNA known as point mutations). However, macromutation, or sudden large changes in DNA, was not considered a major cause of evolution by that time.

By the Mid-Twentieth Century, the Causes of Evolution Were Seen