Biology · Developmental Biology
Karl Ernst von Baer's objection to Ernst Haeckel's embryological proposal (Biogenetic Law) was based on the observation that:
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- 1Embryos of all vertebrates are identical until late development.
- 2Embryos never pass through the adult stages of other animals.✓
- 3Embryos never exhibit any vestigial structures like gill slits.
- 4Adult vertebrates (other than fish) possess functional gill slits.
Correct answer
Embryos never pass through the adult stages of other animals.
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