Respuesta :
To answer this question we need to know the age of Earth, which is 4.543 Billion years. The four eras that make up the geologic time scale are:
Precambrian Era: This era includes events from the earth’s formation until about 640 million years ago.
Paleozoic Era: The 400 million years following the Precambrian Era make up the Paleozoic Era.
Mesozoic Era: This era was dominated by the dinosaurs. The Mesozoic Era began 252.2 million years ago, following the conclusion of the Paleozoic Era, and ended 66 million years ago,
Cenozoic Era: It dates back roughly 66 million year ago.
When we change these ages into percentage, the result would be:
Precambrian: 4055 million years; 88%
Paleozoic: 300 million years; 7%
Mesozoic: 179 million years; 4%
Cenozoic: 66 million years; 1%
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