According to Piaget, _____ is the realization that objects continue to exist even when they can no longer be perceived

Define reductionism. Discuss the limitations of the reductionistic idea that if a depletion of certain chemicals in the brain accompanies depression, then the depletion must be the cause of the depression

What are the limitations?

An example of a dependent variable in an experiment might be:

gender. blood type. eye color. level of depression.