Human activities are impacting the environment in all of the following ways except A. agriculture
B. air pollution
C. population growth
D. oxygen use
E. water use

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.