Answer:
To moisten and to protect the airway from stuff like unknown pathogens and infection
Explanation:
The Trachea also known as the windpipe has tons of 'little hairs' called cilia in the epithelium that protect the throat. When someone smokes or breathes in gases it is destroyed and exposes the trachea. But thats another story. :)
Chemical energy is stored in the bonds of sugars. When the bonds of a sugar molecule are broken, a burst of energy is released that the cell can use. Cells can release energy in two basic processes: cellular respiration and fermentation.
<span>The model of modern human origins depends, in part, on the archaic interbreeding of Neanderthals and Homo Sapiens (not the modern Homo Sapiens Sapiens, which is what human beings are to this day.) From this coupling rose a species, us, which was tough and less impervious to cold, a quality gained from the Neanderthals, and a more robust brain size, a quality obtained from Homo Sapiens.</span>