Question

Describe the four principal biological system of the earth

Answer 1

Answer:

Heya Students !!!!

Answer :

There are four principal biological systems of the earth. They are fisheries, forests,grasslands and croplands.

They form the foundation of the Global economic system. They supply us food. They all provide all the raw materials for industry accept minerals.

Human demands on these systems are increasing to a point where there productivity is impaired .

Answer 2

The four principal biological systems of the earth are fisheries, forests, grasslands and croplands. In addition to supplying our food, these four systems provide virtually all the raw materials for industry except minerals and petroleum-derived synthetics.