The system of rules that governs how we assign meaning to the morphemes we use is called ______

During young adulthood, the heart muscle starts to become ____, but this is not noticeable except during times of ____

a. more pliable; deep relaxation b. more rigid; intense physical activity c. more pliable; intense physical activity d. more rigid; deep relaxation

A person's body mass index (BMI) is his or her ____

a. ratio of height to weight b. percentage of body fat c. weight as compared to age d. type of body style