3.3 pounds (1.5 kg) 5.7 pounds (2.5 kg) 1 pound (0.5 kg) 8.2 pounds (3.7 kg) At what age does our brain finish forming completely? 18 25 35 8 True or False: Humans only use about 10% of their brains That is a myth. We use all of our brain, we just use different parts at any given moment.
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