The images above show a plastic stick attracting small pieces of brightly colored paper. if the stick has a positive charge, then the paper that sticks to it must have

NEGATIVE CHARGE

Explanation:

Opposites attract

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.