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animal extinction Many animals became extinct in past two centuries.There are four main reasons:One is humanbeing ,they invade the animals` land and made them homeless. And there are hunters killed animals until they no longer exist. Pollution also caused many animals to die. Another one is the climate change which may caused dinosaurs` extinction.

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animal extinction

Many animals have become became extinct in past two centuries.There are four main reasons:One is human beings ,they invade the animals` land and made them homeless. And there are hunters have killed animals until they no longer exist. Pollution has also caused many animals to die out. Another reason one is the climate change which may have caused the dinosaurs` extinction.

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