What are principal biological systems of earth and how they are depleting?
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the 4 principles of biological systems are fisheries , forests , grasslands and croplands. but man's demands on these systems are are reaching an unsustainable level .
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The four principal biological systems of the earth are fisheries, forests, grasslands and croplands. In addition to supplying our food, these four systems provide virtually all the raw materials for industry except minerals and petroleum-derived synthetics.
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