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Mezoic era began 252m years ago and ended 6.6m years ago.
It was a time of geological and biological transition. During this era the continents began to drift to their present configuration.
3 of the largest mass extinction occurred at this era. One which include the dinosaurs.
I hope this helped. :)
I have posted the answetr in this picture.
Density<span> is </span>defined<span> as the ratio between mass and volume or mass per unit volume.
Source is google
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