What are enzymes used in the body for?

Enzymes are proteins and they control the speed of chemical reactions in your body. Without them, the reactions would happen too slowly to keep you alive. 
Some break down larger molecules into smaller ones and those enzymes are in your stomach. 

It's either -limiting factors or -scarce resources but i'd go with my first answer since the food and water are abundant they really aren't scarce

Atransverse wave (lowest wave) and a the transverse  wave's wavelength .