haylieshaven1
haylieshaven1
26.02.2021 • 
Biology

Which of the following is the best example of natural selection? (1) A cheetah living in a zoo lives 10 years longer than average.
(2) The shell of a crab becomes harder over time as a result of being hunted by a predator.
(3) A person's muscles become firmer from riding a bike for exercise.
(4) A population of a rabbit's decreases in number as some move to another area.

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