Fill in the blank: Researchers who seek to replace damaged genes that cause inherited diseases or to genetically engineer bacteria are studying A. Zoology

B. Planets

C. Ecology

D. Biotechnology

d i think

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.