Question

Question 4.
Which are the earth’s principal biological systems? What is their current ecological status?

Answer 1

Answer 4:

The earth’s principal biological systems are — fisheries, forests, grasslands and croplands. These are the foundation of global economy as they supply food and raw materials for industries. The current ecological status of these systems are under threat. Human claims on these systems are reaching an unsustainable level. This has resulted in almost collapse of fisheries, disappearing forests, grasslands are converting into barren wastelands and croplands are also deteriorating. Many species are on the verge of extinction.