The correct Answer is Extinct Species
Explanation
The International Union for Conservation of Nature (IUCN) Red List of Threatened Species is a comprehensive inventory of the global conservation status of biological species. It uses a set of precise criteria to evaluate the extinction risk of thousands of species and subspecies.
Statement-wise Analysis
- Endangered Species
- Correct. Endangered Species is a category under the IUCN Red List classification for species facing a very high risk of extinction in the wild.
- Vulnerable Species
- Correct. Vulnerable Species is a category under the IUCN Red List classification for species facing a high risk of extinction in the wild.
- Extinct Species
- Incorrect. Extinct Species is a category under the IUCN Red List, but it is not a category of 'Threatened Species'. A species classified as 'Extinct' (EX) means there is no reasonable doubt that the last individual has died. Threatened categories include Critically Endangered, Endangered, and Vulnerable.
- Rare Species
- Correct. Rare Species is a category under the IUCN Red List classification, often considered a sub-category or a descriptor for species that are naturally uncommon and thus susceptible to becoming threatened. While not one of the three main 'Threatened' categories (Critically Endangered, Endangered, Vulnerable), it is distinct from 'Extinct'.
Key Takeaway
The IUCN Red List classifies species into various categories based on their extinction risk, with 'Extinct' indicating that a species no longer exists, and 'Threatened' categories (Critically Endangered, Endangered, Vulnerable) indicating varying degrees of high extinction risk in the wild.