In recent years,$DNA$ sequences (nucleotide sequence) of $mt-DNA$ and $Y$-chromosomes were considered for the study of human evolution,because

  • A
    They can be studied from the samples of fossil remains
  • B
    They are small,and therefore,easy to study
  • C
    They are uniparental in origin and do not take part in recombination
  • D
    Their structure is known in greater detail

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$II.$ Homology in vertebrate brain indicates common ancestry.
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