The Characteristic Larval Stage of Brittle Stars Is the

Q9: The echinoderms that most closely resemble fossil

Q10: In sea stars,contraction of the _ force

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.

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

Q18: Embryologically,the echinoderm water vascular system originates as

Q19: The water vascular system of echinoderms carries