Where is the ozone layer located?

Suggest one word for each of the following statements/definitions:
$(a)$ The physical and biological world where we live in
$(b)$ Each level of food chain where transfer of energy takes place
$(c)$ The physical factors like temperature,rainfall,wind and soil of an ecosystem
$(d)$ Organisms which depend on the producers either directly or indirectly for food

What percentage of ozone layer depletion was recorded in the South Pole region?

Which radiations are prevented from reaching the Earth by the ozone layer?

Which of the following is an example of biodegradable waste?

In a food chain,the third trophic level is always occupied by