The use of multiple methods to study one research question is referred to as ______.

In the example given in the textbook of relaxation training for autistic children, the "maturational factors" were

A) independent variables. B) dependent variables. C) classification variables. D) potential confounding variables.

Which of these are found in abundance in the northern part of California?

a. Dry deserts b. Palm trees c. Rock formations d. Thick forests