Roundworms are more closely related to arthropods than to flatworms.
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Q17: Many, though not all, mollusks have a
Q18: Mollusks are more closely related to flatworms
Q19: What do sponges and cnidarians have in
Q20: What defines radial symmetry?
A)Any plane of symmetry
Q21: Why are echinoderms and chordates closely related?
A)Because
Q23: Serial repetition of segments is a defining
Q24: A key characteristic of echinoderms is _.
A)their
Q25: Which phylum is most closely related to
Q26: Which of the following features are used
Q27: Flatworms are most closely related to the
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