Gradual genetic development is often represented as a tree similar to the one shown in the diagram.

This diagram suggests that


A only the most well-adapted organisms will survive.
B speciation is a predictable event that happens every few years.speciation is a predictable event that happens every few years.
C different groups of organisms may have similar characteristics because of common ancestrydifferent groups of organisms may have similar characteristics because of common ancestry
D biochemical differences show that no two organisms could ever have had a common ancestor.