Question

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Answer 1

A Embyological evidence

B Studying these early stages in multiple animals can help us learn about how different species may have evolved.

C  Many fishes have an operculum. However, humans and other amiotes (“reptiles”, birds, and mammals) don’t have an operculum. However, our embryos still develop an opercular flap. In fish, the opercular flap remains to the form the operculum; in amniotes, the flap fuses with the neck region and then disappears