The ingestion of alcohol during pregnancy is related to a birth condition called fetal alcohol syndrome, which does NOT include which symptom?

Intelligence has a heritability coefficient of about .5 which means

a. about 50% of an individual's intelligence is due to heredity. b. about 50% of the differences in intelligence between people is due to heredity. c. about 50% of an individual's intelligence is due to environmental factors. d. about 50% of the differences in intelligence between people is unable to be measured.

Kipsigi infants walk considerably earlier than North American infants because

A) Kipsigi babies are smaller at birth, requiring less leg-muscle strength for standing. B) Kipsigi babies have a genetic tendency toward early motor development. C) North American babies are mentally overstimulated, resulting in less motivation to walk. D) Kipsigi parents emphasize early motor maturity, practicing formal exercises to stimulate particular skills.