What is the molecular formula of ozone?

Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

Where is the ozone layer located?

An ecosystem includes

In the food chain
Grass $\rightarrow$ Deer $\rightarrow$ Lion
operating in a forest,what will happen if all the
$(a)$ lions are removed?
$(b)$ deers are removed?

What is the physical environment of an ecosystem called? Give one example.