Which organisms obtain nutrition from the dead bodies of plants and animals?

Distinguish between food chain and food web.

In the following groups of materials,which group$(s)$ contains only non-biodegradable items?
$(i)$ Wood,paper,leather
$(ii)$ Polythene,detergent,$PVC$
$(iii)$ Plastic,detergent,grass
$(iv)$ Plastic,bakelite,$DDT$

What is the role of decomposers in an ecosystem?

Mention one negative effect of our affluent lifestyle on the environment.

Suggest suitable mechanism$(s)$ for waste management in fertiliser industries.