Question

(ii)
How many Earth's principal biological systems are there?
Name them.​

Answer 1

Answer:

four principal biological systems

The earth has four principal biological systems. These are: fisheries, forests, grasslands and croplands. They form the basis of the world's economic system.

Answer 2

Answer:

The earth has four principal biological systems. These are: fisheries, forests, grasslands and croplands. They form the basis of the world's economic system.

Explanation:

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