Q: What is needed for changes to occur?
Options:
- (A) exercise
- (B) mutations
- (C) growth
- (D) healthy animals
- (E) environment
- (F) evaporation
- (G) Exfoliation
- (H) births
Let's think step by step below.

user
Mutations are essential for evolution to occur. Evolution Change through time. Mutations are essential for changes to occur.
Thus, the answer is (B).
assistant