Humans didn't exist hundreds of millions years ago there is no written record of what conditions.
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Answer:
The first humans emerged in Africa around two million years ago, long before the modern humans on the same continent. There's a lot anthropologists still don't know about how different groups of humans interacted and mated with each other over this long stretch of prehistory
One of the earliest known humans is “handy man,” who lived about 2.4 million to 1.4 million years ago in Eastern and Southern Africa