Based on this kind of biogeographical evidence, a scientist might propose the following
hypothesis: The common ancestor of the cactus family evolved in the area now called
South America. Which of these statements best supports this hypothesis about the
common ancestor of the cactus family?
A According to the theory of continental drift, the Atlantic Ocean has become wider
over time.
B
According to the theory of evolution, organisms change over time because they are
better adapted to their environment.
C According to the theory of plate tectonics, South America and Africa were once
connected.
D According to the theory of natural selection, organisms adapt to their environment
over time.