occurs when a species disappears from a part of its range but persists elsewhere
when so few members of a species are left that they are unable to carry out their role in an ecosystem
species no longer found anywhere on earth; forever
a species whose numbers are so small that the species is at risk of extinction
a species that could become endangered in the near future
the worth that something has because of its use
value of an organism, species, ecosystem, or the earth's biodiversity based on its existence, regardless of whether it has any usefulness to us
habitat destruction, invasive species, population, pollution, overharvesting (factors endangering species)
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