Scarcity is a condition that exists because people's wants are greater than that can be made from all available resources. for line one (its either goods, opportunity cost, or wants.) for line two it is either (services, needs, or trade offs)

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.

i got 3,4 and 5 as an answer