During development in the mother's uterus,human embryos have pharyngeal pouches (sometimes called gill slits)that later develop into various glands.Fish also have pharyngeal pouches as embryos,but these develop into gills.The best explanation for why human and fish embryos develop pharyngeal pouches is
A)humans and fish share a common ancestor that had gills.
B)human embryos need gill slits to breathe in the uterus.
C)humans and fish both develop pharyngeal pouches by random chance.
D)fish evolved from humans.

Question

Quizplus · Accepted Answer

The fact that both humans and fish embryos develop pharyngeal pouches suggests that they share a common ancestor that had gills, and the pharyngeal pouches are remnants of this shared ancestry.

During Development in the Mother's Uterus,human Embryos Have Pharyngeal Pouches