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Five-year-olds who were surprised to discover that a Band-Aids box contained pencils were able to anticipate their friend’s false belief about the contents of the box. This best illustrates that the children had developed a

The principle that properties such as mass, volume, and number remain the same despite changes in the forms of objects is called

A cross-sectional study is one in which

A critical period is a phase during which

Nutrients and oxygen are transferred from a mother to a fetus through the

Children’s tendency to classify toys and songs as either masculine or feminine is most likely to facilitate the process of

The term social clock refers to

Infant monkeys raised with a nourishing wire mother and a nonnourishing cloth mother

At age 12, Sean is happy, self-reliant, and has a positive self-image. It is most likely that Sean’s parents are

The awareness that things continue to exist even when they are not perceived is known as