sec, tox, form,

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Across
  1. 1. synonym of quarter
  2. 4. making changes in something to improve it
  3. 7. an antibody that counteracts a toxin
  4. 10. synonym of disinfect
  5. 11. over the past year the earth has turned ___
  6. 12. the process of being formed
Down
  1. 2. rhymes with pharmacology
  2. 3. changing into something
  3. 5. a whole split into 2 equal parts
  4. 6. something students wear to school thats compulsory
  5. 8. a part of something
  6. 9. divide by passing or lying across each other