Most animal phyla are radially symmetrical. True or False?
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Q75: An arthropod exoskeleton is composed of:
A)cellulose.
B)calcium carbonate.
C)silica.
D)chitin.
E)lignan.
Q76: Of all of the invertebrate phyla, only
Q76: Groups of similar cells that function together
Q77: An animal whose body cavity is completely
Q78: Chordates and echinoderms are both protostomes. True
Q80: Cephalopods are the only mollusks that have
Q82: How does the circulatory system of an
Q84: The organism shown here is a(n):
Q90: Explain why natural selection would have favored
Q98: A jointed exoskeleton is a characteristic of_
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