Which of the following type of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100mm

The reservoir for the gaseous type of bio-geo chemical cycle exists in

If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be.

The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called:

Edaphic factor refers to: