2. In directional selection, what is the beneficial trait? intermediate phenotypic form of a trait
traits that maximize an organism's ability to attract mates
two extreme phenotypic
forms of a trait
one of the extreme phenotypic forms of a trait

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

the correct answer is c   with the systems

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.