The organisms in a community are independent. what does this mean?

It would mean that the organisms rely on each other for survival.

Hope this helps (:

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 the answer would be d