An endangered species is a population of an organism which is at risk of becoming extinct because it is either few in number, or threatened by changing environmental or predation parameters.
Human beings are currently causing the greatest
mass extinction of species since the extinction of
the dinosaurs 65 million years ago. If present trends
continue one half of all species of life on earth will
be extinct in less than 100 years, as a result of
habitat destruction, pollution, invasive species,
and climate change.
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