Your fill in the blank answer is: Homeostasis
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Genetically Modified food, also known as GMO's, are chemicals that farmers and such put in cops or animals food in order to make them bigger, more tasteful, and have possible more shelve life. Hope this somewhat helped:)
If untreated sewage gets into rivers, microorganisms decompose it. They use oxygen from the water for aerobic respiration. As a result there is less oxygen dissolved in water, so aquatic organisms such as fish and insects may be unable to survive.