Question

what were the main use of fire for early man

Answer 1

the invention of fire lead to the development of new age humans: -
1) it gave them warmth .
2) it helped them to cook food .
3) it helped them scare away harmful animals .

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Answer 2

For the early man main used of is for following things:
For cooking food.
For protecting themselves from wild animals.
For light.
For producing heating.