Science

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Across
  1. 4. - Instrument for viewing objects too small for the naked eye
  2. 6. - Nerve cell transmitting electrical signals
  3. 9. - Process by which plants convert sunlight into energy
  4. 11. - Molecule containing genetic instructions
  5. 12. - Variety of life forms in a given area
  6. 13. - Basic unit of matter
  7. 16. - Process of species change over time
  8. 18. - Change in the DNA sequence
  9. 20. - Controlled procedure to test a hypothesis
Down
  1. 1. - Large systems of stars, gas, and dust
  2. 2. - Proposed explanation based on limited evidence
  3. 3. - Nuclear reaction combining atomic nuclei
  4. 5. - Transfer of heat through direct contact
  5. 7. - Force attracting objects to each other
  6. 8. - Substance with a distinct molecular composition
  7. 10. - Community of living organisms and their environment
  8. 14. - Physics theory describing subatomic particles
  9. 15. - Physicist famous for the theory of relativity
  10. 17. - Sun and all celestial objects orbiting it
  11. 19. - Substance composed of one type of atom