Adult sponges are sessile, which means that they
a. have no gastrula stage.
b. attach to a surface and do not move.
c. use a jellylike substance for body support.
d. produce both eggs and sperm
Answer: b
a. have no gastrula stage.
b. attach to a surface and do not move.
c. use a jellylike substance for body support.
d. produce both eggs and sperm
Answer: b