integrated writing求砖头

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in this lecture, the professor completely chalenged the claim that the introuduced species boomed by the growth of the international trade cast negetive effect on the local ecological system. according to her speech, the benefit of new species introduced to non-origin area outweigh its disadvantages.
she first points out
that the introducing of new species which have stronger competitivenss dose not necessarily cause the massive extinction of the native species. she explains that other foctors such water pollution might be the real cause that lead to the extincition of local fishes.
apart from that, contradciting to the statement of the reading material, she also contend that the introuduced speices can provide benefit to the ecological balance of a region. the new comers can creat the opportunity to diversify the local ecology system and mange to enrich the evironment, thus contributing to a better ecological balance. this is the second point that differ from the arguement of the reading material.
Finally, the professor argues that new species might be helpful to solve the environmental problems of a region. he take a new plants mesquite the most common tree in Mexican desert as a example illustrating this theory. the this tree can survive in dry areas solving environmental problems. and this tree can also used as firewood etc., which could contribute to the conomic gain of the native people.
whis the thired part the directly contridicts the viewpoint of the reading material.