1) What percentage of vertebrate mammals has been lost since 1970? a) 20% b) 40% c) 60% 2) How many animals and plant species face extinction today? a) 500,000 b) 1 million c) 2 million 3) How much faster are we losing animal species than the natural evolutionary rate? a) ten times faster b) fifty times faster c) a hundred times faster 4) How many northern white rhinos are left on the planet? a) 2 b) 22 c) 42

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