At birth the human brain is only about ___________ percent of its adult weight. By the second birthday the brain will have increased ___________ to percent of the weight of the adult brain.

Question

Quizplus · Accepted Answer

At birth, the human brain is about 25% of its adult weight. By the second birthday, the brain will have increased to about 80% of the weight of the adult brain. Therefore, option D (25; 80) is the correct answer.

At Birth the Human Brain Is Only About ___________ Percent