Question

what is the difference between threatened and endangered species?

Answer 1

Threatened species are those that, if the negative factors continue then they may move into the endangered species category.
Endangered species are those which may become extinct if the negative factors continue.

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Answer 2

Endangered is any species that is in danger of extinction throughout all or a significant portion of its range. Threatened is any species that is likely to become an endangered species within the foreseeable future throughout all or a significant portion of its range. Extinct is when a species no longer exist.