True or false the Han dynasty built the Great Wall to welcome foreign invaders and influence

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?

What words in the preamble to the constitution reflect the principle of popular sovereignty

All living things share certain characteristics. which of the following characteristics is not shared by all living things?