What are four ways that Zheng He spread China's influence around the world

the answer would be in this answer. someone already asked the question.  

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.

nothing

hope this !

portugal is the westernmost country in europe.