This is an odd question considering that the Xylem AND the Phloem delivers water, sugars and other important substances to the roots from the leaves. The answer is definitely NOT the Parenchyma, as that is a ground tissue in non-woody plants.
You and a group of friends are spending your vacation hiking through the mountains. it is cold in the mountains. you will be expending a lot of energy while hiking and you will need plenty of energy to keep you warm. you should pack foods high in to provide the most energy or kilocalories per gram of food. a) carbohydrates b) lipids (fats) c) proteins d) sugars