Why do we close our eyes when we sleep

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse

A17,250 kg rocket is pushed with a thrust of 6,450,284 n. what is the acceleration of the rocket?