__________ methods operationally define the sampling design of the study

Color blindness is more common among males because:

most color blindness is inherited through a recessive gene on the X chromosome. males have only one Y chromosome. most color blindness is inherited by a recessive gene on the Y chromosome. the gene for color blindness is a dominant gene.

Which substance below enhances dopamine release in the nucleus accumbens?

A) caffeine B)sugar C) cocaine D) saccharin E) Clozapine