skeleton is located outside the body

type of symmetry where body can be divided into right and left sides

animals with a backbone

type of symmetry where there is no way to divide body into two equal halves

young worm with a protective covering

animals without backbones

type of symmetry where body parts are arranged around a center point

arm-like parts of a stinging-cell animal

small openings in the body of a sponge

thin, fleshy material that covers a soft-bodied animal

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