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8 March, 07:16

What are the three unifying characteristics of chordates?

A) Dorsal nerve chord, radial symmetry, three layers of cells

B) Water vascular system, backbone, gill slits

C) Exoskeleton, notochord, lungs

D) Notochord, gill slits, dorsal nerve cord

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Answers (2)
  1. 8 March, 09:06
    0
    Answer is D. Notochord, gill slits, dorsal nerve cord.
  2. 8 March, 10:04
    0
    The answer is choice d.
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