what are the criteria for scientist to consider a species extinct? maybe they just didnt search enough, like given the vastness of earth there r probably areas still unexplored?
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There is no one way to definitively prove that a species is extinct, but there are several indicators that can suggest that a species is no longer present. For example, if a species has not been seen or detected in its natural habitat for a prolonged period of time, and efforts to locate it have been unsuccessful, it is considered to be possibly extinct. Similarly, if the habitat of a species has been significantly altered or destroyed, and the species is unable to adapt, it may also be considered possibly extinct. In some cases, a species may be declared extinct if there is no reasonable doubt that it is no longer present. This can be a difficult determination to make, and it is often based on a combination of factors, including the length of time the species has been missing, the amount of effort that has been made to locate it, and the availability of suitable habitat.
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