Letters A through F on the graph below represent different species that are related but show different structural, functional,
and behavioral adaptations.
Increasing Level
of Complexity
more
Time (millions of years)
One inference that can be drawn from the graph is that
A) speciation may be either gradual or abrupt.
B) speciation occurs only gradually, over long periods of time.
C) species E is the ancestor of species F.
D) species E resulted from the extinction of species A, B, C, and D.