Question

on average, 2- and 3-year-olds sleep _______ hours per day, while 4- to 6-year-olds sleep _______ hours.

a)10 to 11; 11 to 12

b)11 to 12; 10 to 11

c)11 to 12; 13 to 14

d)13 to 14; 11 to 12

Answer

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