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Which trait is found in early embryos of both birds and humans, but then disappears from each during development?

soft shell
scales
tail
gill slits.

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Answered by GPT-5 mini AI
gill slits

Both bird and human embryos show pharyngeal (gill) slits/arches early on. In fish they become functional gills, but in birds and humans they are remodeled into other structures and disappear.