Starches are to simple sugars as proteins are

to amino acids. As starch breaks down in the presence of many digestive enzymes to glucose, the simplest form of all complex sugars, proteins too break down into its simpler constituents.

the core of the sun is so hot and there is so much pressure, nuclear fusion takes place, hydrogen is changed to helium. nuclear fusion creates heat and photons. when the heat reaches the earth it warms the molecules of the atmosphere, and they warm other molecules and so on.