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Which of these characteristics is common only at the embryonic stage of fish and humans, and is suggestive of a common ancestor between the two?

Which of these characteristics is common only at the embryonic stage of fish and humans, and is suggestive of a common ancestor between the two?
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Which of these characteristics is common only at the embryonic stage of fish and humans, and is suggestive of a common ancestor between the two?

User Michael Ilyin
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5 votes

they both had gil slits

User Mrcasals
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4 votes
Fish and human embryos both have gill slits.
User Mim
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