How many different proteins composed of 100 amino acids could possibly exist?

The number of possible proteins in humans is twenty.

The number of amino acids you can use it's called n, and the number of possible proteins then will be P=20^n.

In this case, you have 100 amino acids if you replace the n in the equation P=20^100 possible proteins.

velocity and height

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.