Which one of the following statements is correct?

Question

Which one of the following statements is correct? (A) there is no evidence of the existence of gills during embryogenesis of mammals (B) all plant and animal cells are totipotent (C) ontogeny repeats phylogeny (D) stem cells are specialized cells.

Tardigrade Admin · Accepted Answer

Haeckel (1810) proposed that developing animal embryo passes through stages resembling adult forms of its ancestors. Eamst Haeckel (1868, 1874) formulated biogenetic law or recapitulation theory which states that ontogeny (developmental history of an individual) repeats phylogeny (development history of races).

Q. Which one of the following statements is correct?

there is no evidence of the existence of gills during embryogenesis of mammals

all plant and animal cells are totipotent

ontogeny repeats phylogeny

stem cells are specialized cells.