(A) The $Mesozoic$ era is known as the 'Age of Reptiles'. During this era,early mammals and birds evolved from reptilian ancestors. Specifically,the f

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(A) The $Mesozoic$ era is known as the 'Age of Reptiles'. During this era,early mammals and birds evolved from reptilian ancestors. Specifically,the first mammals appeared in the Triassic period,and the first birds appeared in the Jurassic period,both of which fall under the $Mesozoic$ era.