Which theory of color vision is best able to explain negative color afterimages?

Mild intellectual developmental disorder is linked mainly to:

a.) malnutrition. b.) parent's retardation. c.) sociocultural and psychological causes. d.) childhood trauma or injury.

The human brain is able to distinguish approximately __________ different color variations

a. 7 thousand b. 7 billion c. 7 hundred d. 7 million