Which individual has had the greatest influence in our understanding of the way people confront death?

Research reveals that we respond most quickly to emotional stimuli that are:

a) neutral. b) negative. c) ambiguous. d) positive.

In which substage is the child acting as a little scientist, experimenting in purposeful ways with

familiar objects? a. Primary circular reactions b. Secondary circular reactions c. Tertiary circular reactions d. Beginning of mental representation