How long have the Aboriginals inhabited Australia?
At least 45,000–50,000 years.
How were they able to migrate to Australia?
The first settlement would have occurred during an era of lowered sea levels, when there were land bridges between Asia and Australia.
When and how did Tasmania become and island?
Tasmania became an island when sea levels rose sometime between 13,500 and 8,000 years ago, thus isolating Aboriginal people who lived there from the mainland.
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