Question

which of the following is not a classification criteria for phylum porifera? a. asymmetrical b. composed of spicules or spongin c. central cavity d. organ level organization

Explanation:

Porifera are simple multicellular organisms without true tissues and organs. They are asymmetrical, have a body composed of spicules or spongin, and a central cavity (spongocoel). But they do not have an organ - level organization.

Answer:

D. organ level organization