Why is it important to control other factors in an experiment

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?

When rutherford performed his metal foil experiment, he was surprised that most of the alpha particles

Explain the causes and effect of damage to the genetic code.