Bilaterians develop specialized organs because they have:
A) radial symmetry.
B) bilateral symmetry.
C) two germ layers.
D) three germ layers.
Correct Answer:
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Q115: The group mollusks includes:
A)sponges and placozoans.
B)crustaceans and
Q116: Both vertebrates and echinoderms (sea urchins and
Q117: The majority of all known animal species
Q118: _, such as sea squirts, share features
Q119: Ecdysozoans include insects and make up more
Q121: Examine Figure 44.31, below. Q122: Insects: Q123: The _, which includes the sharks, skates, Q124: Chordates include: Q125: Examine Figure 44.31 below. 
A)generally give birth to live young.
B)typically have
A)tunicates and echinoderms.
B)cephalochordates and arthropods.
C)tunicates and
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