In the United States nearly ____ of 10 children and adolescents with ADHD receive Ritalin or other medications to reduce their ADHD symptoms

The extra 21st chromosome that is found with Down syndrome usually comes from the father's sperm

Indicate whether the statement is true or false

In the context of operant conditioning, a fixed-ratio schedule of reinforcement is a schedule

A. that provides reinforcement for a response only if a specific time period has elapsed. B. that focuses on the amount of time that has elapsed since a person or animal was rewarded. C. in which reinforcement is given only after a specific number of responses are made. D. in which reinforcement occurs after a varying number of responses rather than after a specific number.