An echinoderms water vascular system opens to the outside though the ring canal.

When an echinoderm exerts a pulling force on an object, muscles pull the centers of the tube feet upward.

An adult starfish has radial symmetry.

Some sea urchins defend themselves using long sharp arms.

If a sea star is pulled into pieces, each new piece will produce a new sea star.

A starfish can turn its stomach inside out and digest food outside of its body.

If an echinoderm has slender, flexible arms, can move rapidly, and feeds on detritus, it is a sea urchin.

In echinoderms oxygen is carried throughout the body in a closed circulatory system.

In the water vascular system of a sea star, the madreporite connects the ring canal to the tube feet

A starfish has two stomachs.

The skeleton of an echinoderm is an

Echinoderms are like vertebrates in that they

Sea lilies and feather stars

The echinoderms that look like warty, moving pickles are

In most species of echinoderms, respiration occurs mainly in the

Which structure is part of an echinoderms water vascular system?

Two echinoderms that are in the same class are

The plates of the endoskeleton are reduced and combined inside a soft , muscular body wall in

Which of the following statements about the water vascular system of echinoderms is correct?

The water vascular system of echinoderms is involved with each of the following functions EXCEPT

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