Probability sampling is most likely to be used in what type of research?

Researchers find that many teens with conduct problems are also depressed; this is an example

A) disinhibition. B) overlapping disorders. C) amplification. D) comorbidity.

Other than natural aging, which of the following are other known factors to increase the risk for hearing loss?

a. smoking cigarettes b. excess of calcium c. exposure to sun d. sleep deprivation