Australia is one of Earths twelve mega several(a) nations. Its unique plant life, is typified by the uniquely Australian gum tree, distinguishes Australia as one of the worlds sextette floristic regions. not b bely is Australia rich in species, but most of its autochthonous plants and animals are endemic; that is, they occur naturally only in Australia. Australias high levels of uniqueness arise because for more than 50 cardinal years, Australia has been an island unstained and its wight and flora has evolved in isolation. cardinal pct of Australias flowering plants, 84 % of mammals, 89 % of reptiles, 93 % of frogs, and 85 % of seaward marine fish are unique to Australia. level(p) among the passing alert birds, 45 % of species are confined to Australia. There are many a(prenominal) reasons why Australia is rich in species. Despite an absence of loquacious mountain ranges and extensive forests, the continent spans nearly 35 degrees of analog from 5 degrees in the north to nearly 40 degrees southeast and has a precipitous rainfall gradient from the lopsided Continental fringes to the arid interior. These gradients from the tropics to the cool temperate zones and from the wet to the wry produce a succession of communities, each with its distinctive and highly adapted flora and fauna.
The long stableness of the continent has besides been important in the evolution of a diverse fauna and flora and the continents richest plant communities are found in the southwest of Western Australia and in the east on the sandstones wrap Sydney. both regions make believe a long history of s tability and have not been glaciated or cove! red by the oceans for tens of millions of years. The reference of some flora can be traced nates to the Pangaean multiplication For example, the fossil kauri pine Agathis jurassica... If you penury to let down a full essay, order it on our website: OrderCustomPaper.com
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