In terms of evolution, would a species that lives in a climate that has undergone drastic changes evolve more than a species that lives in a climate that has remained the same? Or would it evolve less? Why?
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Assuming that some species survived, the drastic changes would cause the "survival of the fittest" to come into play. Those that are able to find food and shelter will reproduce and live. There would be more evolutionary changes in this situation than the other because in the maintained climate, those that have been surviving will continue to survive.
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Evolution is not drastic. It will take a long period of time for an organism to undergo such changes.
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Generally, two populations of the same species will evolve at the same rate. If there were a drastic change in climate, the population would be exposed to more selection pressures. I'll let you come up with your answer from that.