ecosystem - a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life., decline - to become less in amount., endangered - a type of organism that is threatened by extinction, sleep deprivation - condition that occurs if you don't get enough sleep, pollutants, - carbon monoxide, lead, nitrogen oxides, ground-level ozone, particle pollution (often referred to as particulate matter), and,

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