Echinoderms and chordates are thought to be related because ____.

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6 years ago

Echinoderms and chordates are thought to be related because ____.

Echinoderms and chordates are thought to be related because ____.
a. both have embryonic cells with spiral cleavage

b. both have embryonic cells with radial cleavage
c. both have amniote eggs
d. they lived at the same time
e. both have embryonic cells with nested cleavage

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