Much of the wrinkling of the skin associated with aging is caused by ____.
A. the body producing fewer keratinocytes
B. the body producing fewer melanocytes
C. exposure to environmental chemicals
D. exposure to ultraviolet rays
Answer: D
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When Pavlov's dog salivated to the sound of a bell in the absence of food, the salivation was the __________.
A. conditioned response B. unconditioned stimulus C. conditioned stimulus D. unconditioned response
Training has been shown to have moderate to no influence on speeding up motor development
Indicate whether the statement is true or false
Which of the following probably has a role in the development of a homosexual sexual orientation?
a. Sons become gay when they have a domineering mother and a weak father. b. Heredity and hormones seems to influence sexual orientation. c. Girls are more likely to become lesbians if their fathers are their primary role models. d. Children who are raised by gay and lesbian parents usually become homosexual.
Axons commonly divide at the end into branches called axon terminals
Indicate whether this statement is true or false.