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variation (sources (environmental factors (Contributors (food, soil,…

- - - - food
      - soil
      - climate
      - water
  - - - chromosomes mutation
        
        alteration in the structure of the number of chromosomes during mitosis and meiosis
      - crossing over
        
        exchange of genetic material
        
        results in new arrangement of alleles on the chromosomes
        
        creates new combination of genes in the gametes
        
        contributes genetic diversity
      - gene mutation
        
        alteration of base sequence of DNA (addition, substitution, deletion, inversions