A major report by the United Nations suggests that some ecosystems are close to the tipping point when they are becoming less useful to humans, leading to a decline in biodiversity. More than one in _____ of all mammal species are close to extinction and one in _____ of all amphibian species are close to extinction.

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1. A major report by the United Nations suggests that some ecosystems are close to the tipping point when they are becoming less useful to humans, leading to a decline in biodiversity. More than one in _____ of all mammal species are close to extinction and one in _____ of all amphibian species are close to extinction.