Melvin Calvin

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Across
  1. 4. contain equal number of protons but different number of neutron
  2. 5. a person who studies chemistry
  3. 7. process that helps plants involving sunlight
  4. 10. meaning to be intelligent
Down
  1. 1. the study of life
  2. 2. smallest unit in a chemical compound that can take part in a chemical reaction
  3. 3. Depression a period of time when the economic system declined sharply
  4. 6. a branch of science
  5. 8. ideas that try to explain something
  6. 9. a person who studies science