The common name acorn worm is derived from the appearance of the __________ of these worms.
A) collar
B) proboscis
C) hepatic cecum
D) trunk
E) tunic
Correct Answer:
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Q37: Attached crinoids are called
A)sea daisies.
B)sea lilies.
C)sea urchins.
D)basket
Q38: Sea cucumbers belong to the echinoderm class
A)Holothuroidea.
B)Crinoidea.
C)Asteroidea.
D)Ophiuroidea.
E)Concentricycloidea.
Q39: Sea urchins and sand dollars belong to
Q40: The primary circulatory medium in echinoids is
A)blood.
B)hemal
Q41: The nervous system of enteropneusts is _
Q43: The circulatory system of enteropneusts sends blood
Q44: The ciliated larva of an acorn worm
Q45: The water vascular system of echinoderms carries
Q46: Ambulacrarians and chordates are united into the
Q47: Echinoderms and hemichordates are more closely related
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