His friends begin to criticize marco as a "juice-head," pushing him out of their social circle. feeling rejected, marco begins to drink even more, becomes bitter, and joins a new group of friends who also are heavy drinkers. according to lemert, marco's situation illustrates

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.