If eras are marked by major changes in life forms, what distinguishes one period from the next

Answer;

-Periodic large-scale mass extinctions

If eras are marked by major changes in life forms, periodic large-scale mass extinctions distinguishes one period from the next.

Explanation;

The geological time scale is that the history of the planet counteracted into spans of your time marked by varied events. There are alternative markers, just like the forms of species and the way they evolved, that distinguish just one occasion from another on the geological time scale.

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