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The Mesozoic Era began 252.2 million years ago, following the conclusion of the Paleozoic Era, and ended 66 million years ago, at the dawn of the Cenozoic Era.
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The branch of science which deals with the study of gradual change of species is called evolution.

The correct answer is species.

These are the eras in which the major species which dominates the land and the earth were reptiles.

During those eras, the reptiles are the common link.

Hence, the correct answer is reptiles.

For more information, refer to the link:-

https://brainly.com/question/19200238

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