What enzyme speeds up the breakdown of proteins in food?

Pepsin.

Explanation:

Pepsin is produced in the stomach. It breaks down proteins into smaller peptides.

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.