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

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Natural resource managers ______ the needs and behaviors of wildlife.

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

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Ha Long Bay is the product of geological ______ that lasted more than 500 million years.

The new varieties of rice grow well ______ in poor soil.

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The search for the new kind of penguin in Antarctica has been ______ international media attention.

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Scientists have been studying different ecologies ______ the 20^th century.

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The local farmers are trying to stop the invasive species from spreading for the past six months.