Question a and b both
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The process of evolution changed the human brain gradually.
It was not at all an overnight change but took thousands of years to improve the human brains.
With the environmental factors, food habits, the lifestyle and the thought processes working as a catalyst, the size of the human brains varied.
Almost all early Homo sapiens had their brain equal to the size of the brain of this generation, but it has passed through many changes during the period.
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