All of these are related to the formation of oil or natural gas except - a) decomposed animals b) decayed plants eliminate c) sedimentary rocks d) active volcanoes

I think that the answer is sedimentary rocks

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 got you i did it ya know what it is just needing to fill this in for a quick task!