What is a limitation that affects the generalization of research results?

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?

Which three sentences in the story indicate that the passage is an ex nihilism type of creation story?

When zhang qin went to explore west, he brought back stories of