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Angiosperms, or flowering plants, form seeds in protective chambers called ovaries. They are classified into monocots (one seed leaf) and dicots (two seed leafs). Animals such as birds or the wind usually carry out the transfer of pollen to female sex organs. Water transfer in angiosperms is carried out through wide tubes called vessel elements. Fiber reinforces the xylem of angiosperms and therefore specializes in support. Fruits come from ripened flower ovaries. They function in protecting dormant seeds and are changed to help animals in seed dispersal.