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Introduction

     All organisms are influenced by other organisms within a community. No organism exists independently of others. Some relationships between organisms benefit one type of organism without harming the other. Some relationships, however, benefit both types of organisms.

     Sometimes two types of organisms have a permanent relationship in which one depends upon the other for survival. This is called symbiotic relationship.

     Many bacteria live with other organisms in a type of relationship called symbiosis. For example, the bacteria living in your mouth are in a symbiotic relationship with a human. A symbiotic relationship may help or harm the organisms involved.

 

 

When we try to pick out anything by itself, we find it hitched to everything else in the universe.

 --John Muir