Producers,consumers,and decomposers are which type of components of an ecosystem?

Write two characteristic features of energy flow in an ecosystem.

The environment is only regarded as a pristine collection of plants and animals.

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

State with reason any two possible consequences of the elimination of decomposers from the Earth.

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