Maintaining a rich variety of genetic material that may lead to discoveries useful to humans can be ensured by

c

explanation:

idk

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.

i think its y= -4x-14

the question isn't complete here so i can't right an answer '_'