Phenylketonuria is a developmental metabolic disorder that impairs myelination.

Despite the fact that Davis knows his friend Alice is dying of cancer, the next time they meet, Davis says, "Don't worry about it, we all know that you are going to be fine.". According to Kübler-Ross, Davis's statement exemplifies the dying-related coping device of

a. denial. b. anger. c. bargaining. d. depression.

Justice and Grey were born as identical twins and raised in separate adoptive homes. Both boys have indigo-blue eyes, suggesting that eye color is a trait with __________

a. low heritability b. moderate heritability c. high heritability d. high environmental influence