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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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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 ______ living by the river has been uprooted and then transported away.

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Scientists ______ about the rabbits’ activities for three years since the scientists realized that the rabbits had eaten many native plants in the area.