The functional definition of global extinction is:

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BlackTom AI · Accepted Answer

The question asks for the functional definition of global extinction, and we should first restate what the prompt provides before evaluating options.
The prompt presents the statement: "a. no individual of a species has been recorded alive in more than 50 years" as part of the answer, but does not list other options to compare.
Since no other options are given, we can assess the provided statement in relation to the standard concept of global extinction.
Global extinction means that a species no longer exists anywhere on Earth; there are no living individuals left in the wild or in captivity, and there is no reasonable expectation of any future individuals arising. This is a complete absence across the entire geographic range and all populations.
The given statement, describing a 50-year absence as the criterion for global extinction, mixes a rule of thumb sometimes used for assessing long-term absence or for declaring local extinction in some contexts, but it is not a universal or formal definition of global extinction. In practice, researchers and organizations (like the IUCN) evaluate extinction based on exhaustive surveys, absence across all known habitats, and likelihood of persistence, rather than applying a fixed time window alone.
To summarize, the statement implies a temporal threshold (50 years) as the defining criterion, which is not consistent with the formal, global extinction definition that hinges on total nonexistence worldwide, not merely a time since last recorded sighting.
If other options were provided, we would compare each to the formal definition: true global extinction = no individuals anywhere; false global extinction criteria = any criterion that relies on time since last observation, restricted habitats, or probability estimates rather than absolute absence.

LINC101_S1 Quiz #2

The functional definition of global extinction is:

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