First vertebrates were appeared in a period of palaeozoic era, called
- ASilurian
- BOrdovician
- CDevonian
- DMississipian
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$A$ : India falls under oriental realm out of other biogeographical realms.
$R$ : World is divided in six biogeographical realms.
$A$ : India falls under oriental realm out of other biogeographical realms.
$R$ : World is divided in six biogeographical realms.