In the United States, approximately how many children live with both of their biological or adoptive parents?

Being able to delay gratification is just one aspect of _______________

a. self-awareness b. empathy c. persistence d. regulating emotions

Research involving infants' numerical knowledge suggests that 6-month-olds can

A) discriminate quantities up to five. B) perform simple addition, but not subtraction. C) distinguish among large sets of items. D) add and subtract large sets of items.