Imagine a population of mice that is either long-tailed or short-tailed. if a forest fire happened to kill most of the mice with short-tails, the population of long-tailed mice would increase due to natural selection genetic drift gene flow mutation

genetic drift look up the definition and youll understand why.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

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