energy for life

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Across
  1. 2. substance that is neither acidic nor basic, indicated by a pH of 7
  2. 4. biogeochemical process where nitrogen is converted into different chemical forms through the Earth
  3. 7. made of amino acids; needed for the body to function properly
  4. 9. the continuous movement of carbon atoms through Earth's atmosphere, plants, animals, and oceans
  5. 14. sugar molecules, can be complex or simple
  6. 16. plants use sunlight, water, and carbon dioxide to create their own food (sugar) and release oxygen
  7. 19. substance formed by the chemical combination of two or more different elements
  8. 20. negatively charged subatomic particle
  9. 22. tiny, dense center of an atom, containing positively charged protons and neutral neutrons
Down
  1. 1. anything that occupies space and has mass
  2. 3. the capacity to do work or cause change within a living organism
  3. 5. colorless, odorless gas that is essential for most living organisms to breathe and survive
  4. 6. group of two or more atoms bonded together, forming the smallest unit of a substance
  5. 8. chemical process by which organisms break down food molecules (glucose) to release energy (ATP)
  6. 10. one carbon atom bonded to two oxygen atoms, CO2
  7. 11. an element with one proton and one electron
  8. 12. bond that shares electrons
  9. 13. an electric charge where an atom or molecule has more protons than electrons
  10. 15. chemical substance with the same number of protons
  11. 17. particle within an atom (electron, proton, neutron)
  12. 18. complex organic compounds that store and express genetic information in cells
  13. 21. group of fatty, waxy, or oily compounds that are insoluble in water