All living organisms depend on one another for food. The relationships of these organisms that feed on one another is co-dependent. It starts off that the producer gets energy from the sun then the primary consumer would come in. Afterwards the secondary consumer would come after and eat the primary consumer. This cycle continues to the tertiary consumer until you get to the top. These living organisms rely and depend on each other and if one organism that was lower in the chain were to become extinct this would have a devastating affect on the rest of that ecosystem .