Purpose mean intended or result end determination
Digestion<span> begins in the mouth with chewing and ends in the small intestine. As food passes through the GI </span>tract, it mixes withdigestive<span> juices, causing large molecules of food to break down into smaller molecules.
found at
</span>Your Digestive System and How It Works | National Institute of ...<span>https://www.niddk.nih.gov/health-information/health...digestive-system/.../anatomy.aspx</span>
I didn't quite understand what do you mean but if you mean what items uses triangle, some examples are: ladder, folding chair and everything that be fold that are supports
