preventing cane toad from spreading

The passage provides three possible solutions to hamper increasingly spread of cane toad in Australia. However, professor rejectes mentioned solutions and says that these solution will not be sucessful, and son they will damage environment. First, the author of the passage imparts that a national fence avoids cane toad to spread. The lecturer, on the other hands states that fence never stop spreading of toads, since young toads and eggs carry through rivers and streams. As a result they will flow from one side to onother ones and their population will be established in other regions. Second, the volunteers help to stop toad to spread by capturing and then destoy them, according to the article. The professor rejectes this view by explaining that volunteers are untrained, and they destroy native frogs. They are not able to distinguish between frogs, hence, they make numerous terrible consquences like those in the South america. Third, the reading claims that producing virus is a reasonable solution to toad spreading cross autralia. The lecturer, on the contrary, repudiates this point by saying that some researchers have transfered virus to other regions which the virus attacked the native frogs. Since, the virus are a ecollogically disaster for ecosystem, they will endanger not only native species, but also whole ecosystem.