Some flowers last longer with sugar added to the water because some
plants will be able to use the sugar as a source of energy and live
longer. All living organisms need energy in the form of some kind of
food. Normally plants can capture the energy from the sun, store the
energy in the form of sugar and use the sugar later as a source of
energy. Flowers lacking the sugar or flowers that cannot use the sugar
delivered by the water as an energy source will not live as long because
they will not get as much energy as they need
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