A) triassic period
B) Jurassic period
C) cretaceous period
D) none of these.
Correct Answer: B
Solution :
: The mesozoic era lasted for 110 million years and called as the age of reptiles. The mammals had their beginnings in mesozoic era and the oldest mammals appeared in the Jurassic period. But these mammals remained inconspicuous till the end of the era. The coenozoic era is termed as the age of mammals.
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