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Local extinction

occurs when a species disappears from a part of its range but persists elsewhere

Ecological extinction

when so few members of a species are left that they are unable to carry out their role in an ecosystem

Biological extinction

species no longer found anywhere on earth; forever

Endangered species

a species whose numbers are so small that the species is at risk of extinction

Threatened species

a species that could become endangered in the near future

Instrumental value

the worth that something has because of its use

Intrinsic value

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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