Definition: this is the set of skills and abilities necessary for an organism to live.

answer; i believe that the correct answer is(d) nondisjunction during meiosis;

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.