Both (animal) and human activities contribute to land pollution.
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Hope this helps you!
When western medicine and public sanitation were exported to the least industrialized nations, this caused a surge in their population which outstripped food supply and resulted in malnutrition, mass starvation, and political unrest, this illustrates the description of a Latent Dysfunction.
Well.. Usually no...
Unless they didn't sterilize or clean the tools used for the surgery.
Which would be quite the rare occasion...
good luck!