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| 1. |
how are the earth principal biological system being depleted |
| Answer» There are four principal biological systems of the earth :Fisheries, forests, grasslands & croplands. Human beings exploit the resources which hampers their productivity. Today, the protein conscious human beings consume fish in a substantial quantity due to which fisheries collapse. Forests are cleared for firewood and various other reasons. Due to imprudent activities of humans, grasslands turn into barren wastelands and croplands deteriorate. | |