In what organ does the exchange of nutrients and waste takes place?
a. amniotic sac c. umbilical cord
b. placenta d. none of these
B
Psychology
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Which of these would be the most effective reinforcer for changing specific behaviors associated with autism?
a. a pat on the head b. the child's favorite food c. a smile and the comment "great!" d. getting to play a game with a parent
Psychology
Older adults with low levels of the chemical acetylcholine in their brains may develop memory loss. Which of the following psychological perspectives does this best relate to?
a. Biological b. Cognitive c. Sociocultural d. Learning
Psychology