The human embryo goes through a period of time with gill slits,an inheritance from an ancient ancestor.

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The human embryo does go through a period of time with gill slits, which is a remnant of our evolutionary history, where our ancestors did have gills for aquatic respiration. However, these structures do not actually function as gills in humans and later develop into different structures in the body.

The Human Embryo Goes Through a Period of Time with Gill