Answer:
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The best statement would be increased eutrophication caused by high levels of nitrogen and phosphorous. Nitrogen and phosphorous are found in fertilizers. These fertilizers are used by farmers in croplands. Excess use of these might lead for the excess amounts to run off to water bodies which may cause eutrophication. Therefore, altering the nitrogen and phosphorous cycles.
It seem like there are information missing on the question posted. Let me answer this question with all I know. So here is what I believe the answer is, The adult, or sporophyte, phase is the main phase of an angiosperm's life cycle . As with gymnosperms, angiosperms are heterosporous. Therefore, they generate microspores, which will produce pollen grains<span> as the male gametophytes, and megaspores, which will form an ovule that contains female gametophytes.</span>
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