What are food stamps and how do they work?

The correct answer on Edgen is:

Stamps (paper) which are issued by the Government and when received by the poor are tradable for different goods.

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d.) continue to rise rapidly

the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.