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communities of animals and plants interacting with their environment
In coral reef ecosystems, plants serve as a source of oxygen for fish.
made to be thrown away after use
Each year, Americans toss millions of disposable plastic bags into the trash.
causing much discussion and disagreement
The city’s controversial decision to close schools led to many protests.
to make unfit for use by adding something harmful
Cars, trucks, and factories can all contaminate the air we breathe.
made clean or pure; freed of harmful substances
The Red Cross provides purified water to areas affected by natural disasters.
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