Achemical that is released by an animal as a signal to other members of the same species is called a pheromone. t or f

that is true. its like when a horse goes into heat. *ready to mate*

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.