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Chapter 25 (Soil (Pioneers must tolerate severe condition (Pioneers must…

- - - - First plants have no neighbors
        
        First plants have no neighbors
        
        Live on soil-- CO2 from root respiration provides carbonic acid and Excelerates chemical weathering
        
        A horizon – upper most known leaching
        
        B horizon zone of DEPOSITION
        
        See her Rison composed of parent rock and fragment
        
        1 more item...
- - - - Directions cause mutualism competition
        
        Competitive exclusion= lesser adapted species- superior competitors
        
        Niche= no other species adapt to use
  - - - Tolerance range = between low and high extram temperatures
        
        Metabolic processes respond proportionately