Birds and mammals in geological development of earth arose in period
Permian
Carboniferous
Jurassic
Oligocene and eocene
It's Obvious
$A$ : Tyrannosaurus rex had fearsome dagger like teeth. $R$ : Tyrannosaurus was largest dinosaur depending upon herbs and shrubs.
Dinosaurs dominated the world in which of the following geological eras ?
The last major evolutionary advancement among the vascular plants was the emergence of flowering plants (angiosperms) about
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