Human embryos have a developmental stage during which they have a tail and pharyngeal pouches (those pouches develop into gills in fish). How can we explain these characteristics of human embryos?

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Human embryos spend time in the water where tails and gills are useful.

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Human embryos share a common ancestor who had gills.

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Human embryos need a tail and gills to breathe during development in the placenta.

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Human embryos have a developmental stage during which they have a tail and phary...

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