Fossil evidence of animal life dates back __________ years.
A) 125 million
B) 350 million
C) 570 million
D) 900 million
E) 1.8 billion
Correct Answer:
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Q4: Animals that are hermaphroditic usually
A) fertilize their
Q8: The first phylum with three germ layers
Q42: "Nerve net" describes the nervous system of
A)flatworms.
B)cnidarians.
C)annelids.
D)sponges.
E)none
Q43: Mesoglea is found in which of the
Q44: Which of the following phyla is characterized
Q45: Bilateral symmetry is characteristic of
A)cnidarians.
B)sponges.
C)jellyfish.
D)flatworms.
E)corals.
Q47: An organism that possesses a scolex and
Q48: A planula is a
A)sedentary, attached, tree-shaped form
Q49: Nematocysts are found only in
A)cnidarians.
B)nematodes.
C)crustaceans.
D)echinoderms.
E)sponges.
Q51: Which body plan is characterized by simple
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