Which statement about the cell membrane is true? it contains cellulose and sugars that are involved in communication. it is present in animal cells only. it is rigid and elastic for supporting the cell’s shape. it prevents harmful substances from entering a cell.'

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