I only know what question 5 is which is D. Sorry:(
I do believe the second answer is the right one
AnswerThese are the enterocoelomates.Starfish, sea urchins are examples.Generally animals of the phyla annelida, molluscs and anthropoda belong to this group.
They are animals formed by enterocoely; in which the mesoderm arises from the wall of the embryonic gut archentron. The latter is an hollow outgrowth which forms the coelom.It is the type of coelom found in deuterostome animals.
Explanation:
Serological testing is based on the fact that a<span>ntibodies react specifically with an antigen.
Body immune system can detect a foreign antigen and make a specific antibody to bind that antigen. If this antibody is detected in your blood, it means your body immune system already exposed to the antigen. This can prove the existence of infection.</span>
