Is there a list of statements you have to choose from?
If so, please tell us them. If not, you can summarize it by saying something like:
Water starts at a spring, heads to the sea then vaporizes and is pushed back to land where is condenses and rains, flows to the sea, and the cycle starts again.
It is called Fertilization and is the fusion of the male and female gamete
A) G1; S; G2 and then M
It is the correct order ; if you need specification on all phases comment !!
They share lack of back bone, use tube feet to move, and I’m not sure about the open circulatory system because mollusks that fall into cephalopod category have closed ones but all others have open as well as echinoderms