Homeostasis refers to a. the similarity of genetic traits to one another b. a mixture or solution that is the same thoughout c. the effect of natural selection on human evolution d. the tendency of a cell to maintain a stable internal environment

D. The tendency of a cell to maintain a stable internal environment.

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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.