Ch. 13- Section 4: Flashcard Review

Front

What do sea urchins, sand dollars, and sea biscuits use to protect themselves from predators?

Back

spines

Front

What characteristic of echinoderms allows them to sense food, predators, and other things in their environment from all directions?

Back

radial symmetry

Front

What are the hollow, thin-walled tubes that have suction cups on the end in echinoderms?

Back

tube feet

Front

How do echinoderms move?

Back

They use their tube feet- as pressure in the tube feet changes, they push out and pull them in.

Front

What is the reason scientists hypothesize that echinoderms resemble vertebrates more than other invertebrates?

Back

complex body systems & embryos that develop the same as embryos of vertebrates.

Front

What type of skeleton do echinoderms have?

Back

endoskeleton.

Front

What is the main body symmetry of echinoderms?

Back

radial symmetry.

Front

What is the function of tube feet in echinoderms?

Back

They help in movement and feeding.

Front

What are the small, movable structures on the surface of echinoderms called?

Back

spines.

Front

What is the term for the water vascular system in echinoderms?

Back

a network of fluid-filled canals that helps in movement and feeding.