Matura Choices książka 1/56 Look at photo (a) of the human brain and answer the questions. Check your answer on page 117. 1) The adult brain wighs about: a 900g b 1600g c 1350g 2)The brain has ........ of neurons and brain connections. a thousands b millions c billions 3) The brain uses .......... of our body's energy. a 20% b 5% c 15%