... many kinds of plants and animals are becoming rare a supply b survival c influence d interference 11 Tropical forests have supplied us with many sorts of plants for food, medicine, and industry ... out In (9) first three quarters of the twentieth century, eighty-three species disappeared, (10) the education of people about endangered species The rate of extinction has not been slowed ... actually become extinct as a of the oil spill a respect b consequence c protection d production 11 Human beings can’t exist without water and air a result b live c kill d change 12 Do you know...