An isotonic contraction of the muscle is one that ________________

Smoking is responsible for ________ percent of chronic obstructive pulmonary disease (COPD) in United States

a. 60–65 b. 75–80 c. 80–85 d. 85–90

"Magical thinking" begins at age ________ months

A) 12 to 18 B) 18 to 24 C) 24 to 36 D) 36 to 48