Which of the following directly measures brain activity, thus bypassing the traditional approach of measuring indirect signs of emotional arousal?

High school students who are academically below average are more likely to take part in extracurricular activities

A) when they are required to improve their grades in order to participate. B) in large schools with a wide array of clubs, teams, and interest groups. C) in smaller schools where their participation carries more weight. D) that force them to use the academic skills they need to work on.

About ___________ babies born to mothers over 40 have ________

a) 5 out of 10; Fragile X syndrome. b) 1 out of 4; Turner syndrome. c) 6 out of 100; Tay-Sachs. d) 1 out of 100; Down syndrome.