It is a perfect example of a natural selection.
(I'm not sure if this is the exact answer that you are looking for.)
Answer:
people may get sick or kill their crops by using water thats from unfilter or unsustainable, they're could sometimes be bad chemicals and bacteria in the water
Water boils at 100<span>°C</span>
<span>Eukaryota i think this is the right answer
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