How many national parks are there in the united states?

Which leader was the first african american president at two different institutions for higher learning

Ahumid tropical climate brings rain in the summer and drier weather in the winter to the malay archipelago.

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?