What era makes up about 90 percent of earth’s history

At the beginning of the Paleozoic era, all life lived in the oceans. For nearly 4 billion years, during most of Precambrian time, no plants or animals existed. The Hadean, Archean, and Proterozoic eons together are called Precambrian time and make up almost 90 percent of Earth's history.

Explanation:

- "the past is made of multitudinous items ranging from anything that can be collected, recollected or assessed to originate in the past. as such, the past is a gallimaufry of particulars that may not have been related in any way. however, the human mind seeks organization to understand concepts and other things. the human mind therefore seeks relationships in explaining and studying the past. history being a humanity, dictates that historians have to serve this human trait by bringing structure to details of the past. historians do this by creating interpretive frameworks that capture as many details as possible."

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answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.