![]() For example, marsupials are not found on the Asian side of these lines but are found on the Australian side. This separation caused the organisms to the south to develop independently of those in the north. Wallace and Weber believed that no land bridge connected the Asian side with the Austral side for animals to cross over. Papua New Guinea was connected to Australia. During the ice ages, sea level was lower, and the many islands of Southeast Asia were connected by land to the mainland. Both examples attempt to establish the correct line of demarcation for the differences in species development between the two sides. Wallace’s Line and Weber’s Line are two such examples. This has been explained by various biogeographers by drawing imaginary lines just north of Australia to indicate the line of division between the Asian realm and the Austral realm. The biodiversity found here is separate from that of Asia. Many plant species are also unique to this realm. It is believed that these creatures developed separately after the continents broke away from each other more than two hundred million years ago. ![]() The unique biodiversity includes marsupials, or animals whose young are raised in the mother’s pouch, such as kangaroos, wallabies, koalas, and bandicoots. The historic isolation of New Zealand and Australia from the rest of the world has caused animals and organisms that are not found anywhere else to develop in these two countries. ![]()
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