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What is Symbiosis?  

Symbiosis is close and often long-term interaction between two different biological species.
Symbiosis has three types. They are Commensalism,Parasitism and Mutualism.
What are they?
Commensalism describes between two living things where one benefits and the others is not significantly harmed or helped.
Parasitism is about one benefits while the other is harmed.
Mutualism is a relationship between individuals of different species where both individuals benefit.

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simple number         Weight (G)            volume (ml)           Density

           7                       100                         245                   0.40816
           6                       50                           110.9                0.545085
      pumice                   45                           20.92                2.15105
          3                        45                            47                    0.95744
          X                       50                            120.4               0.41528
           2                       50                            137.5               0.36363



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