15,589 SPECIES (7,266 ANIMAL SPECIES AND 8,323 PLANT SPECIES) ARE N...

6. 15,589 species (7,266 animal species and 8,323 plant species) are now considered ____

risk of extinction.

eLib.vn: Thư viện trực tuyến miễn phí 11

A. in B. on C. for D. at