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Humans are responsible for causing changes in the environment that hurt animals and species(物种). We take up more space on Earth for our homes and cities. We pollute habitats(栖息地). ________1.  illegally hunt and kill animals. All of these activities take resources and habitats away ________2.________ plants and animals.

Human activity often changes or destroys the habitats that plants and animals need to survive.  3.________ human populations are growing so fast, animals and plants are disappearing many times faster 4.________ they have in the past 65 million years.

Animals and plants have always had a ________5.________ time surviving. Animals became extinct (灭绝的) in the past for a wide variety of reasons. In some cases, competition for resources among animals led to extinction and in ________6.________ cases, environmental changes caused extinction.

Fortunately, we humans are beginning to realize our mistakes, ________7.________ we could destroy everything on Earth. We must not only use our knowledge and abilities to manage the Earth, but to make the Earth ________8.________ safe and healthy place where all animals and plants——including humans ourselves——can live.

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