Embryologically,the Echinoderm Water Vascular System Originates as Modification of the

Q13: Sea cucumbers belong to the echinoderm class<br>A)Holothuroidea.<br>B)Crinoidea.<br>C)Asteroidea.<br>D)Ophiuroidea.<br>E)Concentricycloidea.

Q14: The characteristic larval stage of brittle stars

Q15: In the sea stars,a(n)_ groove runs along

Q16: Synchronous spawning by enteropneusts suggests the presence

Q17: The principal nitrogenous waste of sea stars

Q19: The water vascular system of echinoderms carries

Q20: In Asteroidea the _ system consists of

Q21: All of the following are true of

Q22: The common name acorn worm is derived

Q23: Sea daisies have a thin membrane,the _,that