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They realised they would have to ban fishing in some areas in order to keep ______ healthy.

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Deforestation activities are destroying the local ______ as well as the archaeological sites.

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The country has vast oil reserves and ______ deposits of other minerals.

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The newcomers can pose a threat to ______ of species by altering ecosystems.

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The host country can undertake conservation ______ to build up or maintain biodiversity.

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Ecosystems _______ a lot of biodiversity are generally stronger and more resistant to disaster than those with fewer species.

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The horse is not native _______ America – it was introduced by the Spanish.

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It is now considered essential for any new fish-farming businesses to consult the relevant ______ agency.