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.
(Answer #1). The respiratory system includes structures such as the mouth, nose, trachea, lungs and the muscular diaphragm. The main purpose of the respiratory system is to draw air into the lungs, where oxygen can be harvested and incorporated into the blood for delivery to the rest of the body.It also functions to remove waste products, such as carbon dioxide, that collect from metabolism.any diseases affect our breathing, such as emphysema, which is a disease that makes gas exchange within the lungs very difficult and breathing to become labored. Bronchitis causes inflammation and mucous production, inducing fits of coughing.