Its their r group. <span>Variations in R group usually lead to different amino acid. E.g Glycine has H(Hydrogen) as its R group, while Alanine has CH3 as its R group. mom makes me listen to her old school stuff so yeah >.<</span>
Answer:
A as they used they used if while the others are fact
Your best answer is C. catalyst can reduce the amount of energy needed for a chemical reaction to take place.
Glad to help ya!! :)