An arthropod exoskeleton is composed of:
A) cellulose.
B) calcium carbonate.
C) silica.
D) chitin.
E) lignan.
Correct Answer:
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Q70: A closed circulatory system is characteristic of:
A)flatworms.
B)annelids.
C)cnidarians.
D)sponges.
E)comb
Q71: Charles Darwin wrote that members of the
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Q78: Chordates and echinoderms are both protostomes. True
Q79: Most animal phyla are radially symmetrical. True
Q80: Cephalopods are the only mollusks that have
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