How do some countries survive in their command economy?

Psychologists studying infant memory want to determine at what age babies can remember specific events. an experimenter uses several puppets to demonstrate a series of actions while the infant watches. after a delay, the experimenter records how many of the actions the child imitates when playing with the puppets. what is the dependent variable?

According to justice brown's opinion, social equality must be the result of what three factors?

When were the exodus of farm workers during the depression