Which of the following are chemical messengers?

Dr. Singh studies the relationship between changes in the brain and the developing person's cognitive processing and behavior patterns. She is part of a group of researchers from the fields of psychology, biology, neuroscience, and medicine

This approach to development is known as A) the information-processing approach. B) cognitive-development theory. C) behaviorism. D) developmental cognitive neuroscience.

An unruly child has become conditioned to fear the sight of the principal's door. Over the past month, however, the child had no contacts with the principal. Now the child will probably ________

a. begin to fear all other doors in the school building b. have an even greater fear of the principal's door c. gradually stop fearing the sight of the principal's door d. maintain former level of fear of the principal's door