Guppies are small fish that live in South American rivers. They can have different- sized spots on their bodies.
The river bottoms are covered in rocks. Guppies with spots that are the same size as the rocks on the bottom are harder for bigger fish to see and catch.
The diagram below shows a population of guppies that live in a river. At time 1, the population had the same number of guppies with small and large spots. At time 2, after many generations, there were many more guppies with small spots and fewer guppies with large spots in the population.
How did the environment change between time 1 and time 2? How did the population change?
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The environment changed between time 1 and time 2 by having more rocks on the river bottom that were smaller in size. This change in the environment resulted in the population of guppies changing as well, with more guppies having small spots that matched the smaller rocks on the bottom. This change in the population was likely due to natural selection favoring guppies with small spots that were better camouflaged and therefore had a higher chance of survival and reproduction.
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