Question to you: What is one of the facets of an organism's evolution?
Options:
- (A) resistance
- (B) fitness
- (C) properties
- (D) thirst
- (E) movement
- (F) swimming
- (G) offspring
- (H) recycling.
Let's reason step-by-step:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Behaviors that improve fitness increase through natural selection. Many organism behaviors have evolved through natural selection. An organism's fitness is a result of evolution. Final answer: (B).