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Because it supports life contains oxygen and atmosphere 
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Earth is called as a unique planet because it is the only planet known that supports life. It has the moderate climatic conditions favouring life. It is also beautiful with so many types of flora and fauna and so many types of species.It has all types of geographical features and the living beings adapt themselves according to the climatic conditions.
Earth is called unique planet because it have atmosphere. Earth have life . All sources are present on earth. Hope this may help you. ....
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