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life past & present (DNA (mutations (environmental factors (uv…

- - - - male XY
      - female XX
- - - - tortoises --> shell shape
      - finches --> diets, isolation, beak structure
    - - different species are similar e.g. whale, human
    - - pen-dactyl limb --> mammals
    - - increase match = increased relatedness
    - - archaeopteryx
        
        bird & reptile traits
        
        transition fossil
- - - - cell
      - organism
    - - DNA
      - gene
      - 1/2 from mum and 1/2 from dad
        
        hereditary
  - - - extra chromosome 21 causes Down syndrome
    - - uv radiation
      - gamma radiation/nuclear
- - - - organs
      - repair
      - save lives
  - - - chance it won't work
      - emotional strain