John has sudden attacks of intense fear in which his heart races, he feels faint, and he has trouble catching his breath. during these attacks, he worries that he is going to die. from this description, it sounds like john has

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.

your answer would b. the missisipi river

hope i you : )