... is, a greater variety of plant and animal species--than any other place. Three square kilometres of forest in South America may have more species of birds and insects than many countries do. In fact, biologists discovered a single tree in a tropical forest in Peru that supported 43 species of ants. That is as many species of ants as live in the entire United Kingdom. Even though many types of plant and animal life can be found in one place in the tropics, the total range of many tropical species is extremely small. As a result, when a large area of forest is cleared, all the members of some species are killed. ...

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