Q. Which of the following option represent extinct species?

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Solution:

In the last 500 years, IUCN Red List (2004) indicates the extinction of 784 species (including 338 vertebrates, 359 invertebrates, and 87 plants). Some examples of recent extinctions are :
Dodo (Mauritius). Quagga (Africa). Thylacine (Australia). Steller's Sea Cow (Russia). 3 subspecies (Bali, Javan, Caspian) of the tiger.
- Extinction of 27 species has occurred in just the last 20 years only.