The ability of your lens to change its thickness and curvature to adapt to images both near and far is called visual __________

Depletion of the neurotransmitter acetylcholine has been implicated as a:

A) treatment of schizophrenia. B) cause of Huntington's disease. C) treatment for Parkinson's disease. D) critical factor in Alzheimer's disease.

Researchers have had trouble replicating studies that found a particular gene linked to schizophrenia. According to one recent hypothesis, ____

a. genes in fact have nothing to do with schizophrenia b. the same genes responsible for schizophrenia also produce Huntington's disease c. spontaneous mutations in any of hundreds of genes can cause schizophrenia d. most genetic researchers fail to examine the X and Y chromosomes