When the grand canyon was forming, a population of squirrels were separated into two groups. the north side of the canyon is at a higher elevation and experiences more rainfall than the south side of the canyon. the two squirrel species you see here had a common ancestor, but over time, have evolved into two different species. how did natural selection lead to different species?
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When the grand canyon was forming, a population of squirrels were separated into two groups. the nor...
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