the answer is a. skin color
Make sure you soak in cold water. If you put it in warm or hot water, you could grow bacteria in the food. Same goes for microwaving.
Oxygen-free radicals that are very proactive molecules with every cellular module/component
This is when you lose weight, gain weight, then lose weight, then gain more weight than you had before!! It can go on for a very long time. Many obese people suffer from this.