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Food Chain - A series of organism each depending others for food
Biotic Factor - A living component attack or affect an ecosystem
Abiotic Factors - A non living component which affect or influence an ecosystem
Ecosystem - A system formed by the interaction of a community of organism with  their environment
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                      a  food  chain  is  a  food  dependence  system  in  which  a serious    of  organisms  are  dependent  on  each other  for  food  which  is needed  for  their  survival.

                          the  biotic  factors are the living things  that affects the life of other living  compounds in the ecosystem

                              the  abotic factors are non living things that affects living  organisms in the ecosystem

                      a  biological  community  of  living  organisms  and  their physical  environment.  where  there  is  a  network  of  interactions between  them

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