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Just Questions to make you think!

Posted about 4 months ago by Nidhi123

My first question is bit based on history. Guys don't go yet!!! Check out the question:
How did the first humans on Earth know that they had to eat when they are hungry?
I mean, they didn't know that they are feeling hungry and should actually put something in their mouth and chew it to swallow it, did they? That is what we call eating! Please reply so that I can clear my doubt.