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.
  Your respiratory system is the system that brings oxygen onto your body and is mainly associated with the lungs and the windpipe bringing the air down from your mouth. T â¦ eh ribs are the bones of your chest that curve round your lungs. They form a cage around the lungs which stops the lungs being crushed.