C) slate, a metamorphic rock
The correct answer is "knee j*rk reaction". The knee j*rk reaction is a type of reflex wherein nerve impulses from the muscle does not have to reach the brain for the appropriate motor response of the body. Reflexes are important as to shorten the response time especially in times when a long response time will harm the body.
Restriction of blood flow, something is blocking the blood flow, heart has slowed down and is being pushed to hard.
Global winds rising near equator and cold air sinking near the poles
