PLAY. <span>Control. The part of an experiment that is not being tested and is used for comparison.
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Explanation:
under what circumstance does a negative cell presents An antigen to another negative cell
<span>It has influence on many things like economy, industry, transport and so on.
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It is an essential element for plant life, but when there is too much of it in water, it can speed up eutrophication (a reduction in dissolved oxygen in water bodies caused by an increase of mineral and organic nutrients) of rivers and lakes. Soil erosion is a major contributor of phosphorus to streams.
I can't answer 1 but 2=First, make sure you weather proof the house, than go from there and try anything you think is necessary in this situation.
