Seastar External Dissection

Radial symmetry is based around

• a circular or central disc

• having arms in all directions

• not needing a head

True or False: Seastars move so slow they can not respond to it environment.

• True

• False

How do echinoderms obtain oxygen?

• through their mouth

• through their skin

• they breathe the air

How does the seastar start to eat its prey?

• It uses its mouth to bite it

• It uses it tube feet to catch and open

• They use tentacles to catch and filter the food

The mouth is the opening to the

• water vascular system

• digestive system

• nervous system