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Answer
Explanation:
I think its because over the years since more individuals with high fur levels survived more harsh environment , animals have evolve high fur-level trait became more common in Population A over time, and the low fur-level trait became less common. The high fur-level trait was an more adaptive trait.
When The distribution of traits and also changed in these populations because as generations passed in this environment in Population A.
Variation of Traits
Then the variation of traits are decreased as the distribution of traits then they are shifted so that there was only medium level fur traits, and also as Population completely died out.
traits changed When the individuals with high fur levels are survived more harsh environment.
Also animals have evolve high fur-level trait became more common in Population A over time, and also the low fur-level trait became less common.
Thus, The high fur-level trait was an more adaptive trait.
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