Que. 1 : Q1) The human brain is made up of 1. a) 50 billion neurons 2. b) 100 billion neurons 3. c) 75 billion neurons 4. d) 25 billion neurons Que. 2 : Q2) The role of the thyroid is to 1. a) Produce hormones and control body metabolism 2. b) Produce hormones only 3. c) Control body metabolism 4. d) None of the […]