Who observed that embryos never pass through the adult stages of their ancestors?

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Von Baer

Charles Darwin

Ernst Haeckel

Richard Owen

answer is A.

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Detailed Solution

The correct answer is A.

Karl Ernst von Baer discovered four criteria of embryology to explain the observed pattern of embryonic development in different species.
Charles Robert Darwin (1809–1882) was a naturalist and biologist best known for his theory of evolution and natural selection.
Ernst Haeckel is most known for his famous remark "ontogeny recapitulates phylogeny," but he also coined numerous terms used by biologists today, including phylum, phylogeny, and ecology.
Sir Richard Owen was a British anatomist and paleontologist who made significant contributions to the study of ancient creatures, particularly dinosaurs.

As a result, the right answer is "Von Baer."

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