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Which one of the following statement is correct?

1. There is no evidence of the existence of gills during embryogenesis of mammals
2. All plant and animal cells are totipotent
3. Ontogeny repeats phylogeny
4. Stem cells are specialize cells

Correct answer: Ontogeny repeats phylogeny

Solution

The correct statement is the classic biogenetic idea that development of an individual reflects evolutionary history. The other options are incorrect because mammalian embryos do show pharyngeal arches, not all cells are totipotent, and stem cells are unspecialized rather than specialized.

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