What are the environmental pressures and variations of a shark

Shark Environmental Pressures. During their 400-million-year reign, sharks have faced environmental pressures similar to those confronting all species -- they must acquire food, escape predators, find mating partners and ensure the survival of their offspring.

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.