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Question
The gill slits of reptile and bird embryos are ______.
Options
vestigial structures
support for ontogeny recapitulates phylogeny
homologous structures
evidence for the degeneration of unused body parts
MCQ
Fill in the Blanks
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Solution
The gill slits of reptile and bird embryos are homologous structures.
Explanation:
Gill slits in reptile and bird embryos are homologous structures because they originate from the same embryonic tissues found in all vertebrates. They show common ancestry, even though they develop into different adult structures.
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