How do the functions of the forelimbs differ among these vertebrates (what are each used for? what does a seal use its flippers for? )

cuz they cant breath

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.