HUMANS DEPEND ON SPECIES DIVERSITY TO HAVE FOOD, CLEAN AIR AND WAT...

20. Humans depend on species diversity to have food, clean air and water, and fertile soil for agriculture

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a. destruction b. contamnination c. fertilizer d. variety

* Read the passage carefully, then choose the correct answer.(1.0 m).

Wild animals play an important part in the (21) _____________ of nature and supply us with manyimportant (22) ___________. Birds and other small animals help control insects. Wild animals provide food and(23) _________, too. Furthermore, they make our surroundings more interesting. Uncontrolled hunting has destroyed a lot of wildlife and people have also harmed animals such as thepassenger pigeon which disappeared completely. Other including the whooping cranes, the blue whale and theAmerican alligator are in danger of dying out. Sometimes it is necessary to keep animals from (24)_____________ too plentiful.