Question

how are the earth's principal biological systems being depleted lesson name
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Answer 1

Answer:

The earth has four principal biological systems. These are: fisheries, forests, grasslands and croplands. These biological systems are being depleted by excessive use. Over fishing is quite common.

Explanation:

The name of the lesson is HORNBILL THE AILING PLANET: THE GREEN MOVEMENTS

This helps you..

Answer 2

Answer:

The Earth's principle biological systems are depleted by excessive use . Over fishing is quite common. Forest are being cut to obtain firewood for cooking. Grasslands are turn into barren wastelands and croplands are deteriorating as their productivity has been impaired.