We live in the cenozoic era, and scientists know more about this era and epochs it’s divided into any other time period. why is this?

Yes,We live in the Cenozoic era, and scientists know more about this era and epochs.

Explanation:

This is because the cenozoic period is one of the three main periods of earth's history which began about 66-million years ago, lasting to the present. It is the latest or the current era of life. In this era, the rock layers are preserved more and destroyed in much lesser degree as compared to previous eras.

The Cenozoic Age is often recognized as the Mammals age because many species of large animals have been annihilated, enabling the preservation and proliferation of smaller creatures as their hunters no longer existed.

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genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).