Which of the following statements is true?

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(D) The statement '$Ontogeny$ $recapitulates$ $phylogeny$' is known as the $Biogenetic$ $Law$ or $Haeckel's$ $Law$ of $Recapitulation$.It suggests tha

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Ontogeny recapitulates phylogeny.

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(D) The statement '$Ontogeny$ $recapitulates$ $phylogeny$' is known as the $Biogenetic$ $Law$ or $Haeckel's$ $Law$ of $Recapitulation$.It suggests that the developmental stages of an individual organism (ontogeny) reflect the evolutionary history of its species (phylogeny).Option $A$ is incorrect because stem cells are undifferentiated,not specialized.Option $B$ is incorrect because mammalian embryos do show vestigial gill slits during early development.Option $C$ is incorrect because only certain cells (like zygotes or meristematic cells) are totipotent,not all cells.

List-$I$	List-$II$
$(i)$ $65$ million years ago	$(p)$ Sea weeds existed
$(ii)$ $350$ million years ago	$(q)$ Invertebrates formed
$(iii)$ $500$ million years ago	$(r)$ Jawless fish evolved
$(iv)$ $320$ million years ago	$(s)$ Dinosaurs disappeared

Column-$I$	Column-$II$
$(1)$ Mutation	$(a)$ Change in population allele frequencies due to chance alone.
$(2)$ Gene flow	$(b)$ Difference in survival and reproduction.
$(3)$ Natural selection	$(c)$ Immigration,emigration change allele frequencies.
$(4)$ Genetic drift	$(d)$ Source of new alleles.

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