Which body plan is characterized by simple gas exchange mechanisms, two-way traffic through a highly branched, saclike gut, and a thin, flat body with all cells fairly close to the gut?
A) cnidarian
B) nematode
C) echinoderm
D) flatworm
E) sponge
Correct Answer:
Verified
Q4: Animals that are hermaphroditic usually
A) fertilize their
Q46: Fossil evidence of animal life dates back
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.
Q52: The bulk of a jellyfish consists of
A)mesoderm.
B)mesohyl.
C)mesophyll.
D)mesoglea.
E)mesogel.
Q53: Tissues derived from mesoderm are absent in
A)sponges.
B)cnidarians.
C)flatworms.
D)sponges
Q54: In the life cycle of the fluke
Q55: Colonial cnidarians
A)include Obelia.
B)include the Portuguese man-of-war.
C)include corals.
D)may
Q56: In the life cycle of a typical
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