Nut is to as pea is to pod.
a. shell
c. tree
b. peanut butter
d. greanbean

a.  nut is to shell as pea is to pod because if you look at the question it will also tell you the answer.

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.

that scientist would be robert hooke