OPT:
A). color of leaves
B). genetic material
C). learned behavior
D). synthetic material
E). the body's largest organ
F). acquired characteristics
G). sensory neurons
H). Most plants

Fact 1: Mutations are essential for evolution to occur. Fact 2: Mutations are changes in the genetic material. Given the two facts above, changes in what are essential for evolution to occur.?
Answer:
B).