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Which one of the following statement is correct?

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

Solution & Step-by-step Explanation

Biogenetic Law proposed by Ernst Haeckel states that "Ontogeny recapitulates Phylogeny," meaning the developmental stages of an embryo (ontogeny) repeat the evolutionary history of its ancestors (phylogeny). For example, mammalian embryos show pharyngeal gill slits similar to fish.

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Which one of the following statement is correct?
A
Stem cells are specialized
B
There is no evidence of the existence of gills during embryogenesis of mammals
C
All plant and animal cells are totipotent
D
Ontogeny repeats phylogeny

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