Sleep serves a number of different physiological and psychological purposes including cleaning up brain toxins and consolidating information into memory.
Answer: I think it is liquid
Explanation:
The smallest bone in the human body is the stapes. Hope this helps :)
Answer:
Epithelium
Explanation:
Epithelium are tissue massage found mostly in the skin and serve as protective covering for the internal and external parts of the body.
A major characteristic of the epithelium is that its layers do not contain any blood vessels such as the artery or vein. The surface of the cells is also usually open to the internal cavity of the organ.