Trees and flowers are biotic factor.  A tree limits the world by giving us oxygen.  Without trees we 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

would have no oxygen and humans would die.  Flowers are also biotic factors and they limit the world

 

 

 

 

 

 

 

 

 

 

 

 

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by giving us crops.  

                -by basketballcrazy2010

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

'