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since they are not yet discovered, there is no exact percentage of plants and animals,

There is an enormously large number of endangered species living in tropical rain forests, and most of these have not yet been "discovered" by scientists. Because rain forests are quickly being converted to farmland and human settlements, many of these species are becoming extinct before humans know anything about them. (it said endangered species how about the none, can you imagine how many are they)

this is the other one:

Because most of Earth's biodiversity (the number of species in a given habitat) is not yet discovered and cataloged, it is likely that there are perhaps several million endangered species on Earth.

thanks to this site:

http://www.scienceclarified.com/El-Ex/Endangered-Species.html

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