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Answer:
The first fossil skulls of Homo erectus, 1.8 million years ago, had brains averaging a bit larger than 600 ml. From here the species embarked on a slow upward march, reaching more than 1,000 ml by 500,000 years ago. Early Homo sapiens had brains within the range of people today, averaging 1,200 ml or more.
Modern humans have brains that are more than three times larger than our closest living relatives, chimpanzees and bonobos.
Explanation for ml:
The ml stands for milliliter. The abbreviation ml is typically pronounced M-L (saying the letters out loud) or milliliter. This one is nice to remember. When you see the little “l” just think to yourself l = liquid. For this abbreviation, ml is one thousandth of a liter, so it's a super small measurement.