The first animal group to show extracellular digestion was the:
A) sponges
B) cnidarians
C) flatworms
D) roundworms
Correct Answer:
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Q11: The advantage of bilateral symmetry is that
Q12: The key evolutionary development seen for the
Q13: Most of the phyla of the animal
Q14: The type of body cavity seen in
Q15: Segmentation was first apparent in the:
A)flatworms
B)annelids
C)chordates
D)vertebrates
Q17: Of the mollusks,snails are in the class
Q18: Which term does NOT apply to solid
Q19: The function of the notochord is taken
Q20: Chordates can be characterized as having:
A)a notochord
B)a
Q21: The three distinct cell layers that form
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