It is lobefins.

The Permian period, during which the first most modern orders of insects appeared, occurred approximately

Give the name of the first organism who invaded land

$A$ : Tyrannosaurus rex had fearsome dagger like teeth.
$R$ : Tyrannosaurus was largest dinosaur depending upon herbs and shrubs.

Cretaceous period of the Mesozoic era is characterised by which of the following?