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Protecting the Few

How we live our lives affects the environment. The environment is all the things around you. All across Earth, humans are __31__the environment in small and large ways. We cut down trees to build houses. We plow fields to __32__crops. We pour waste into rivers, lakes and oceans. We use larger nets and bigger boats to catch __33__number of fish. Activities like these affect plants and animals. They __34__affect things like the soil and water.

Sometimes our actions make the number of a __35__plant or animal get larger. For example, if you planted roses in your yard, these would be more roses in your area.

Our activities can also __36__to a smaller number of plants and animals. If a park were turned into an apartment building, what would happen to the plants and animals there？Well, they would __37__die or move to other __38__. There would be fewer plants and animals.

Pollution and other activities sometimes cause the number of a species(物种)to become so __39__that it cannot survive. A species that is in __40__ of dying out is called an endangered(濒危的) species.