A2-year-old human's brain is percent of the adult brain's weight. 55 65 75 80

The answer to this question would be 75%

At 2 years old, the human brain is already 75% of adult weight. It will be still growing and at 6 years old age it will become 90% of adult weight. The skull will also grow at the same rate because it has to accommodate a space for the brain to grow. That is why the suture joint of the skull in children is not completely closed.

Processes above and be sure to mention the movement of electrons and energy as the carbon atom moves from one reaction to another.