This is because the modern lifestyle we're living and people are living in the US is very taxing and can cause people to feel extremely bad about themselves for prolonged periods of time. Furthermore, it's also possible people/doctors are misdiagnosing depression and saying someone is depressed when he or she actually isn't.
The answer is d) organic chemistry
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An oil spill, fertilizer run off, and another thing i could think of is a flood hope this helped :)
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