These sharp and jagged leaves demonstrate a modified leaf of a plant( big idea 1 #28). Clearly along the evolutionary path to this plant, leaves that had some sort of point or were similar to these occoured in the population over many generations and gave these organisms some advantage over the rest of the population(im guessing animals eating them). These genes bacame more prevelent and are now the wild type.
These plants' leaves have fallen off for winter, but the thin twigs they attach to are located roughly five feet above the water line to assure that they will still be able to photosynthesize when water levels rise, making it a modified stem of a plant( big idea 1 #30). The origins for this probably are that organisms with shorter stems would be submerged and die, or at least fail to reproduce, while those with longer stems survived more frequently.
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