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Most of the Australian population descends from 19th and 20th century immigrants, most from the UK and Ireland to begin with, but from other sources in later years. Although the Australian colonies were founded as a penal colonies (except for South Australia and Western Australia - with the latter later receiving convicts), the transportation of British convicts to Australian colonies was gradually phased out between 1840 and 1868. During the "gold rush" of the late 19th century, the convicts and their descendants were rapidly overshadowed by hundreds of thousands of free settlers from many different countries: for example, in the 1850s about two per cent of the combined populations of Britain and Ireland emigrated to New South Wales and Victoria.

Although most of the continent is desert or semi-arid, Australia nevertheless includes a diverse range of habitats, from alpine heaths to tropical rainforests. Because of the great age of the continent, its very variable weather patterns, and its long-term geographic isolation, much of Australia's biota is unique. Such species that are famously Australian include: koalas, kangaroos, emus, platypuses, wombats and echidnas.

Although Australia was initially largely of British origin, and by the early 21st century was an overwhelmingly city-based society, receiving a large proportion of its cultural communication from either Hollywood and American TV networks, or home-grown productions that some claim are merely imitators.

The most popular spectator sport in Perth is Australian Rules football. Two teams in the Australian Football League (AFL) are based in Perth: the West Coast Eagles and the Fremantle Football Club (or "The Dockers").

In 1901, Australia adopted a federal constitution and became a self-governing dominion of the British Empire. Australian troops took part in both world wars. Since World War II Australia has been transformed by a massive immigration programme. Australia remains a constitutional monarchy with Queen Elizabeth II as head of state: a referendum to establish a republic was defeated in 1999.

Australian immigration has a checkered history. Immigration to the continent now called Australia began over 50,000 years ago, when the ancestors of Australian Aborigines arrived via Indonesia and New Guinea. Europeans began landing in the 1600's and 1700's, and the country was colonised by Britain in 1788.

Melbourne has twice ranked first in a survey by The Economist of "The World's Most Livable Cities", once in 2002, and again in 2004. It is sometimes classed as a "world city"; one study group ranks Melbourne, on the basis of relative availability of specialised "advanced services" as a "minor world city" comparable to cities such as Vancouver, Osaka, and Prague.

Australia's comparative advantage in primary products is a reflection of the natural wealth of the Australian Continent and its small domestic market; 19 million people occupy a continent the size of the contiguous United States. The relative size of the manufacturing sector has been declining for several decades, and now accounts for just under 12 percent of GDP.

Many plants that grow in Australia have special features to combat the forces of nature. Symbiosis is very common, as are plants with sunken stomata and large root stock. The plants are very hardy, and are generally able to quickly establish themselves so as not to miss available nutrients.