The Nucleus is the hub of the cell, the heart and soul of the cell. As much as a quarterback is in a football team. The Nucleus is what keeps the cell going and a cell wouldn't exist without a Nucleus. Hope this helped, have an amazing day :)
Answer:
Nutrient
Explanation:
A nutrient is a chemical substance that all types of organisms require to live.
the purpose of valves in the heart valves is to allow blood to flow only in one direction. Valves open and close on differential pressure on each side. pulmonary and the aortic valves receive blood from the ventricles and their semilunar valves allow blood to go into the arteries and prevent back flow from the artery to the ventricles.
<span>The metabolic processes in the body generate acids - for example lactic acid from anearobic respiration. The blood must be buffered against these acids to prevent them from raising the pH of the blood. Raising the pH of the blood would result in less biologically optimal conditions for tissues, cells and functionally critical enzymes in the bloodstream. For example, blood clotting may not work at very low (ie very acidic) pH.</span>
Cellulose is a polysaccharide made up of glucose monomer units.