Helena first develops the ability to control her head. She then could sit up unassisted, and eventually could walk. This progression of motor development is called the ____

a. cephalocaudal principle
b. thoracic torso principle
c. phalange-metatarsal principle
d. proximodistal principle

Answer: A

Psychology

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The intense fluctuations are faster in bipolar disorder when compared to borderline personality disorder.

a. true b. false

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