Social Studies, 15.04.2020 01:29 anasfis35ovmbff

At 6 months of age, American infants sleep about 14 hours a day, whereas infants who are the same age in Kenya sleep about 12 hours a day, and infants in the Netherlands sleep about 16 hours a day. This variation is best explained by .
a) differences in genetics.
b) cultural practices
c) innate programming.
d) random variation.

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