Which one of the following statements about evolution is incorrect?
A. Evolution of bacteria can be demonstrated in a laboratory by selecting for increases in various metabolic processes.
B. Evolution led to the branches in the tree of life, but development of the organisms within a single branch has subsequently remained constant.
C. Closely related species display a nested pattern of similarity.
D. Organisms that are best able to reproduce contribute disproportionately to subsequent generations.
E. Evolution can have its root in both genetic and environmental forces.
Answer: B
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