Answers

2014-09-15T18:59:25+05:30
The ecosystem is a systematic arrangement of organisms who eat and are eaten.
The organisms are Producers, Primary consumers,Secondary consumer and Tertiary consumer.
Example:
   Bacteria[Tertiary consumer] (After death)
       |
     Man[Tertiary consumer]
       |
     Hen[Primary consumer]
       |
   Grain[Producer].
2 4 2