Invertebrates Test (P)orifera (C)nidaria(E)chinoderms (M)ollusks (R)oundworm (F)latworm (S)egmented worm/annelid (A)rthropod.
Most Mollusks have shells & Echinoderms have spiny skeleton MOLLUSKS ARE SOFT-BODIED ANIMALS MOLLUSKS SHOW A RANGE OF ADAPTATIONS ECHINODERMS HAVE UNUSUAL.
Characteristic of Animals
Viruses Not living Have DNA or RNA + protein coat Must reproduce inside a host cell
