Why don’t plants need a digestive system? a. they do not need nutrients to grow and develop. b. they use energy from the sun to make their own food. c. they create oxygen, which they use as food. d. they absorb water and food through their roots.

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