Question

What is the characteristic of an invertebrate animal?

Answer 1

Answer:

Invertebrates are generally soft-bodied animals that lack a rigid internal skeleton for the attachment of muscles but often possess a hard outer skeleton (as in most mollusks, crustaceans, and insects) that serves, as well, for body protection. The phylum Cnidaria includes the hydras, jellyfishes, and sea anemones.......