Answer:
because harmful substances often chemicals or microorganisms contaminate a stream, river, lake, ocean, aquifer, or other body of water, degrading water quality and rendering it toxic to humans or the environment.
Explanation:
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The farmer wont be able to grow crops because the soil is not usable.
Air mass, letter a is the correct one
Well first off the founders, any amending documentation, and input by the civilian population. From there they can grow, fall, adapt, or die. In seemingly infinite ways the gov. or population can be changed.
