MANY PLANT AND ANIMAL SPECIES ARE NOW ON THE________ OF EXTINCTION....

4. - DE THI ANH VAN HOC KI 12 DE THI AV HKII 201314
DE THI ANH VAN HOC KI 12 DE THI AV HKII 201314

4. Many plant and animal species are now on the________ of extinction.

A. danger B. border C. margin D. verge