Fossil a was found at a depth of 400 feet and fossil b was found at a depth of 315 feet. which one is older?
fossil b
fossil a
they are the same age
not enough information to determine

ok

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.