(B) The $Cenozoic$ era is known as the 'Age of Mammals'.Following the extinction of the dinosaurs at the end of the $Mesozoic$ era,mammals underwent r

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(B) The $Cenozoic$ era is known as the 'Age of Mammals'.Following the extinction of the dinosaurs at the end of the $Mesozoic$ era,mammals underwent rapid adaptive radiation and became the dominant terrestrial vertebrates.Therefore,the correct option is $B$.