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

Which one of the following is an artificial ecosystem?

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

"Flow of energy is unidirectional." Name the first two components of the environment involved in this flow of energy from the sun.

Which of the following is included in edaphic factors?

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