Many geographers still define geography as the study of human relationships, nature. At the end of the nineteenth century, Paul Vidal de la Blache distinguished physical geography and human geography. Geologists distinguish themselves by distinguishing physical features, while geographers study physiqal forms on the Earth's surface. The German school led by Frederic Bratzler speaks of biogeography as 'geography of life is the unity of life based on the need for discipline which includes all forms of life'.
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