Final answer:
Mass extinction is the term used for the event when all organisms of a specific species disappear due to extinction.
Explanation:
Extinction is defined as the death of the last individual of a species. If all organisms of a specific species were to disappear, it would be termed as a mass extinction, which involves most major groups of organisms over a short period. The fossil record shows examples of mass extinctions in Earth's history where more than 50% of animal species died.
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