The viruses contain
Proteins only
$DNA$ only
Nucleic acids only
Proteins, $DNA$ or $RNA$ (nucleic acids)
The most apparent change during the evolutionary history of Homo sapiens is traced in
Which one is not a vestigial organ
$A$ : Sometimes, some babies have a small tail.
$R$ : This is just a type of mutant variety
Recapitulation theory $(Biogenetic law)$ explains "Ontogeny repeats Phylogeny''. It was given by
$A$ : Similarities in proteins and genes performing a given function among diverse organisms give clue to common ancestry.
$R$ : All the group of vertebrates arises from the common ancestor with great adaptation capability.