intro 1

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Across
  1. 3. chemical preparations that provide immunity from a disease
  2. 6. a Scottish scientist who discovered nitrogen
  3. 7. Chemicals that are used to protect the crops from harmful pests
Down
  1. 1. a chemical that are used to prevent wastage of food by microbial growth
  2. 2. a substance made by combining two or more than two metals to resist corrosion
  3. 4. a person who studies and gains specialization in chemistry
  4. 5. a naturally occurring substances from which metals were extracted