During the Cambrian,
A) animals started a great adaptive radiation.
B) all major groups of animals originated in the seas.
C) changes in land masses, climate, and sea level contributed to animal evolution.
D) coevolution of predators and prey and of parasites and hosts was a factor in evolution.
E) all of these occurred.
Correct Answer:
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Q8: The first phylum with three germ layers
Q17: Q33: Sponges have which of the following? Q34: Trichoplax is a Q35: Unlike many other animals, sponges lack Q36: Use the figure above to answer questions Q37: Sponges live in Q39: Trichoplax Q42: "Nerve net" describes the nervous system of Q43: Mesoglea is found in which of the
A)symmetry
B)organs
C)anus
D)spicules
E)appendages
A)sponge.
B)cnidarian.
C)placozoan.
D)choanoflagellate.
E)flatworm.
A)a digestive
A)shallow tropical seas.
B)fresh water.
C)cold, Antarctic
A)is a small, flattened, soft-bodied marine animal.
B)is
A)flatworms.
B)cnidarians.
C)annelids.
D)sponges.
E)none
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