what are the earth biological system ? how do they sustain humanity ?

There r four principal biological systems of the earth.They are fisheries grasslands forests are and croplands.They form the foundation of the global economic system . they supply us food.They provide all the raw materials for industry except minerals.forests provide us with fire wood fuel.

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The earth’s principal biological systems are being depleted by excessive use. Over . fishing is quite common. Forests are being cut to obtain firewood for cooking. Grasslands are turning into barren wastelands and croplands are deteriorating as their productivity has been impaired.
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