Which of the following is an example of natural selection?
During an especially cold winter, brown squirrels that had thick coats survived at higher rates than brown squirrels whose coats were not as thick.
A black squirrel travels from its population to an entirely new population of brown squirrels.
Most of the brown squirrels that had thick coats were killed during a forest fire.
Brown and black squirrels mated and produced offspring that were brownish-black.
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Natural selection is when nature favors a specific trait, and only those with that trait in the environment can survive. Let me give you an example. Let's take people who live in who live dry regions like Africa. They have long limbs, and that's to increase the surface area making it more effective to rid of heat via evaporation, conduction convention. People who live in colder climates like antarctica have shorter limbs to retain cold. If we swapped the two groups you would have a massive response to the weather as either one may not adapt.
Use this example and definition to help you work at your answer.