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Ecotourism is a useful tool to manage and ______ natural and cultural landscape.

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The red squirrel in England is in danger of ______.

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The national park was established to ______ the ecosystem of the limestone forests.

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Natural resource managers ______ the needs and behaviors of wildlife.

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Some people ______ down lots of trees along the river for the past two weeks.

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One of the factors that cause a species to become endangered is habitat ______.

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Naturally, many different species in this freshwater ecosystem share the same kind of ______.