So in animals, these hydrocarbon chains and fatty acids never actually branch. Now, the second point of difference between two or more fatty acids is the number of double bonds. And in this particular case, we have no double bonds. And what that means is this is a saturated fatty acid. Saturated basically means this hydrocarbon chain contains a maximum number of hydrogen atoms. Now, as we add double bonds, that decreases the hydrogen count along this backbone, and that makes the fatty acid unsaturated.