Which of the following is a valid challenge to Piaget's theory?
a. Cognitive abilities develop in discrete steps or stages rather than continuous, overlapping waves.
b. Young children do not understand as much as Piaget gave them credit for.
c. Preschoolers are not as egocentric as Piaget thought.
d. Cognitive development around the world is more consistent than Piaget realized.
C
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According to the Centers for Disease Control (2003), which of the following ethnic groups participates the most in free-time physical activity?
A) African Americans B) Hispanics C) whites D) There are no differences across ethnic groups in free-time physical activity.
Which of the following is a substance that lubricates the lungs and helps the neonate breathe independently?
a. surfactant b. leptin c. acetylcholine d. white blood cells