Question

How much of earths history is precambrain time

Answer 1

The Precambrian time spans about 4 billion years, making up approximately 88% of Earth's history. It includes the Hadean, Archean, and Proterozoic eons. The Precambrian era ended around 541 million years ago with the beginning of the Cambrian period, which marked the diversification of complex lifeforms and the start of the Phanerozoic eon.