Correct Option
Marsupials are a distinct infraclass of mammals characterized by the presence of a marsupium or pouch, in which females carry and nurse their relatively undeveloped young. Australia is globally recognized as the primary biogeographical region for marsupial fauna. The continent's long geological isolation facilitated the extensive adaptive radiation of marsupials, leading to a high degree of endemism. Over 70% of the world's marsupial species, including iconic examples such as kangaroos, koalas, wallabies, and wombats, are native to Australia, making it their most characteristic habitat.
Incorrect Options
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Option (a) Africa: The African continent is predominantly inhabited by placental mammals. Marsupials are not indigenous to mainland Africa.
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Option (c) South America: While South America does host a variety of marsupial species, such as opossums (Didelphimorphia) and shrew opossums (Paucituberculata), their diversity and ecological prominence are considerably less extensive compared to Australia. The marsupial fauna of South America represents a distinct evolutionary lineage from that of Australia.
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Option (d) South-east Asia: True marsupials are largely absent from mainland Southeast Asia. However, some marsupial species, particularly those belonging to the order Diprotodontia (e.g., tree-kangaroos, possums), are found in the eastern parts of the Wallacea region and New Guinea, which are biogeographically distinct from mainland Southeast Asia and share affinities with Australian fauna.