Pick the statement about phloem cells that is accurate throughout. Select one: Group of answer choices Phloem cells are alive at functional maturity because active processes and a plasma membrane are required to generate and maintain sugar gradients. Phloem cells are alive at functional maturity because only a living cell can generate the negative pressure required to move water/sap long distances. Phloem cells are alive at functional maturity because moving water from an area of low water potential to an area of high water potential requires an input of energy. Phloem cells are alive at functional maturity because if they were dead their cell walls would degrade.