Simple sac-like body with only one opening - Cnidaria, Body is long and flattened, with a definite head end. - Flatworms, Body long and thread like, round in cross section - Roundworms, Worms made of segments. Many have bristles - Annelids, Body is segmented with a hard exoskeleton - Arthropods, Body soft and unsegmented. They have a moscular "foot" for movement - Molluscs, Body has a spiny skin and shows a star shaped pattern - Echinoderms,

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