What does the notice mean?

What does the notice mean?

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

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

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Scientists have been developing practical tools and methods to measure the ______ of the ecosystem.

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