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.
Why Oxygen is Important. Oxygen is necessary for your body. It is used by all of your main organs and tissues. When your body does not get enough oxygen, you may have difficulty breathing, problems with your heart, fatigue, loss of memory, headaches, or confusion.