What do scientists use organisms' shared characteristics to do? A) classify the organisms
B) find the organisms' ancestors
C) locate the organisms
D) determine where the organisms live

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.

light dependent reactions:

light independent reactions:

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