Synchronous Spawning by Enteropneusts Suggests the Presence of

Q11: The skeleton of sea urchins consists of

Q12: Coiled masses of fecal material called _

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

Q17: The principal nitrogenous waste of sea stars

Q18: Embryologically,the echinoderm water vascular system originates as

Q19: The water vascular system of echinoderms carries

Q20: In Asteroidea the _ system consists of

Q21: All of the following are true of