how are tha earth's principal biological systems useful to us?
Answers
because of plants and trees and animals and humans are there that's why its principal biological system that is we can breath fresh air ...ect are there
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Human demands on these systems are increasing to a point where their productivity is impaired. ... Mohan : Fisheries, forests, grasslands and croplands are the four principal biological systems of the earth. Geeta : They are the foundation of the global economic system.
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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