Why do people almost never act out their dreams during REM sleep?

a. The content of most dreams includes conversations with no action.
b. People learn, beginning in early childhood, to remain quietly in bed.
c. Brain activity is at its minimum during REM sleep

Summarize the evidence in the matter of the hypothesis that vaccinations contribute to the cause of autism

Have no clue about this one! Please help

Which of the following has been found to be an innate characteristic, particularly among young humans and other animals?

a. A tendency to deceive others to gain personal advantage b. An impulse to play as a way to practice adult skills c. A preference for consistency with a corresponding fear of novelty d. The ability to understand and imitate language