The optimal years in a person's life for reproduction, hard physical work, and athletic achievement are between the ages of ______

The rules that determine how sounds and

words can be combined and used to communicate meaning within a language are collectively known as ________. a) morphemic rules b) phonemic rules c) grammar d) linguistic relativity

Perry works at a job where he is paid by commission. For every car Perry sells, he gets 10 percent of the profits. Perry is being reinforced on a ______

a. fixed-ratio schedule c. variable-ratio schedule b. fixed-interval schedule d. variable-interval schedule