Can somebody help me

Why have the aztec ruins in mexico city not been dug up?

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?

Why is it economically necessary for the east germans to build berlin wall