Question

WA
What are the Earth's lour principal biological systems​

Answer 1

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 .

Answer 2

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

I hope it will help you dear