The method in which the researcher assigns participants to different conditions and ensures that these conditions are identical except for what has been systematically manipulated, best describes the _________ method

How many children suffer from separation anxiety disorder?

a. 50% b. 100% c. 4% d. 10%

"There is really no need to worry about the depletion of the ozone, because human beings will adapt by developing a new outer layer of skin that is more resistant to the radiation of the sun."

This is a statement that suggests we can acquire characteristics that are useful for our survival. Upon whose theory of evolution might this statement be based? a. Sigmund Freud b. Charles Darwin c. Jean-Baptiste de Lamarck d. John Broadus Watson