1 An unopened container should last for 1-3 months at 40Â°F or less in the refrigerator, but some companies guarantee their product for up to 6 months.  If left in its partially-open original paper wrap, the exposed area of stick butter will begin to harden and smell stale after about a week, as oxygen sets in.
Quick Answer. Humans need a respiratory system because it is made up of organs that allow them to breathe. Breathing delivers oxygen to the body and takes away carbon dioxide. Every cell in the body needs oxygen to obtain energy from food. Continue Reading.
The respiratory system provides oxygen to the cells. Without oxygen your cells couldn't move, reproduce or turn food into energy, and of course we would die. The upper part of the system-mouth, nose, sinus, larynx and trachea-help filter, humidify and warm the air as it enters the body.The cilia in the lining of the air passages, and the mucus, protect the lungs from dirt and dust. The air goes through the lungs' bronchi and bronchioles into the alveoli.he upper part of the system-mouth, nose, sinus, larynx and trachea-help filter, humidify and warm the air as it enters the body. The cilia in the lining of the air passages, and the mucus, protect the lungs from dirt and dust.