You are trying to decide which of two horses to bet on. after you make your decision, you are likely to be sure about the horse you bet on because of

they all focused on themes about the inevitability of death.

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.