When did the battles of lexington of concord occur?

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?

How much time on average do americans currently spend watching tv and videos per day?

What would you call a political system that is only meant to last for a short time