The nature versus nurture question asks:

Nature and nurture can be represented by genes and the environment. ... Said debate asks the question: What characteristics of your identity are due to nature (your genes) and due to nurture (the environment)? As it turns out, most diseases or traits are each due to both genes and environment.

Explanation:

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.