WVGSA Grade 8 Science Practice Questions - West Virginia General Summative Assessment Grade 8 Science Exam

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Embryos of fish, reptiles, birds, and humans all display pharyngeal gill slits and a post-anal tail during early embryonic development. What conclusion do evolutionary biologists draw from comparative embryology?

Humans will develop functional adult gills in future aquatic environments Vertebrates share ancestral developmental genes inherited from a common evolutionary ancestor Embryo structures develop completely randomly without genetic regulation Bird embryos are identical to adult fish in physiology

Correct Answer:

Vertebrates share ancestral developmental genes inherited from a common evolutionary ancestor

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