question_answer 19)

  An ecosystem includes (a) all living organisms                    (b) non-living objects (c)both living organisms and non-living objects (d)sometimes living organisms and sometimes non-living objects

Answer:

                  (c) All the interacting organisms in an area together with the non-living constituents of the environment form an ecosystem. Thus, an ecosystem consists of biotic components comprising living organisms and abiotic components comprising physical factors like temperature, rainfall, wind, soil and minerals.