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Which of the following is an example of natural selection?
Two species of cichlid become less and less alike in the lake environment they both share.
A variety of dogs is bred for their ability to hunt animals that dwell in holes in the ground.
Peacocks are selected for mating by females due to their bright plumage.
The venom of a certain salamander species becoming more poisonous as predation by snakes increases.
Sharks and dolphins share similar body shapes and living environments.