Answer:
Muscle Twitching.
Explanation:
A muscle twitch is an involuntary contraction of fibers that make up your muscle. When something causes your nervous system to react, it causes your muscle fibers to contract, resulting in a twitch.
Answer:
Most people have two kidneys, which are located near the back of the body, under the ribs, on each side of the spine. Kidneys filter waste out of the bloodstream, which is passed out of the body as urine.
Explanation: