Triglyceride is an Ester, that is formed by the reaction between 1 glycerol and 3 fatty acid molecules, it's commonly known as fat. It act as storage for energy in the human body and as well as provides insulation. It also absorbs fat - absorbing vitamins in the body. When body needs more energy , it breaks down fat by the process of lipolysis into fatty acids and glycerol and release them in the blood.
There is a very unique form of process for the as whole production of the different organisms inside the environment, as there are plant and animal species of which ancestors had a haploid (or half the number of chromosomes as compared to there parents) but they have a diploid form of chromosomes. Which would be certainly possible after the evolution which took place inside there genome and made them able to survive through generation having much similarity to there predecessors and that is how the species survived even though the process of alternation of generation( as explained) happened inside them.