Amphibia first appeared in which of the following period?
Permian
Carboniferous
Devonian
Silurian
First amphibians originated is devonian period and age of amphibians is carboniferous period.
Dinosaurs dominated the world in which of the following geological eras ?
$A$ : Tyrannosaurus rex had fearsome dagger like teeth. $R$ : Tyrannosaurus was largest dinosaur depending upon herbs and shrubs.
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