When did the dinosaurs become extinct?

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(C) Dinosaurs were the dominant terrestrial vertebrates for over $160$ million years,from the late Triassic period until the end of the Cretaceous per

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Cretaceous period

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(C) Dinosaurs were the dominant terrestrial vertebrates for over $160$ million years,from the late Triassic period until the end of the Cretaceous period. The mass extinction event that led to the disappearance of non-avian dinosaurs occurred approximately $66$ million years ago at the end of the Cretaceous period,often referred to as the $K-Pg$ (Cretaceous-Paleogene) extinction event.

Column-$I$ (Organism)	Column-$II$ (Origin)
$P$. Invertebrates	$I$. $500$ million years ago
$Q$. Jawless fish	$II$. $350$ million years ago
$R$. Sea weeds and few plants	$III$. $320$ million years ago

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Match the following columns:
Column-$I$ (Organism) Column-$II$ (Origin)
$P$. Invertebrates $I$. $500$ million years ago
$Q$. Jawless fish $II$. $350$ million years ago
$R$. Sea weeds and few plants $III$. $320$ million years ago

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