The Following Questions Are Based on the Observation That Several

The following questions are based on the observation that several dozen different proteins comprise the prokaryotic flagellum and its attachment to the prokaryotic cell, producing a highly complex structure.
-Many species of snakes lay eggs, but in the forests of northern Minnesota where growing seasons are short, only live-bearing snake species are present. This trend toward species that perform live birth is an example of

A) natural selection.
B) sexual selection.
C) species selection.
D) goal direction in evolution.
E) directed selection.