What are the two things which are essential for all forms of life on the earth?
The two things which are essential for all forms of life on the earth
(i) The three resources—the land, the water and the air available on the earth.
(ii) The energy which is provided by the sun.
What are the physical components?
What is biosphere?
Where is a hole in the ozone layer detected?
What is biotic component?
