If we were to design an experiment to test the hypothesis that aspirin takes headaches away, the independent variable would be _____ and the dependent variable would be _____

Which of the following is thought to be the most effective form of treatment for the tics of Tourette’s disorder?

When baby Rex is bounced gently on his father's knee, his father can see the skin on the top of Rex's head move up and down, sort of like the skin is covering a bowl of jello. This is because:

a. Rex's brain has not yet solidified and is a soft mass of tissue b. the fontanels in Rex's head have not yet fused into bone c. Rex must have some sort of bone disease that has prevented his skull from forming correctly d. Rex probably has Down syndrome