how are earth's principal biological systems important?
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There are four principal biological systems of the earth. These systems are fisheries, forests, grasslands and croplands. In addition to supplying our food, these four systems provide virtually all the raw material for the industry. ... The forests are destroyed in large proportions to obtain firewood.
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There are four principal biological systems of the earth. These systems are fisheries, forests, grasslands and croplands. In addition to supplying our food, these four systems provide virtually all the raw material for the industry. ... The forests are destroyed in large proportions to obtain firewood.
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