Science Crossword - Hard

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Across
  1. 5. - The natural home or environment of an animal, plant, or other organism (7)
  2. 7. - A stable subatomic particle with a charge of negative electricity (7)
  3. 9. - Process of coding genetic information from DNA into RNA (12)
  4. 13. - The resistance of any physical object to any change in its state of motion (7)
  5. 15. - Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei (7)
  6. 16. - Study of heredity and the variation of inherited characteristics (8)
  7. 18. - Substance that increases the rate of a chemical reaction (8)
  8. 21. - Principle stating energy cannot be created or destroyed (12)
  9. 22. - A type of bond in chemistry involving electron sharing (8)
  10. 23. - The speed of something in a given direction (8)
  11. 25. - The branch of physical science that deals with the relations between heat and other forms of energy (14)
  12. 26. - An individual animal, plant, or single-celled life form (8)
  13. 27. - Microscopic organism without a nucleus (8)
  14. 28. - A type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus (6)
  15. 29. - Band of colors produced by separation of the components of light by their different degrees of refraction (8)
Down
  1. 1. - A type of reaction that releases heat (9)
  2. 2. - Chemical process of cell energy production (11)
  3. 3. - A subatomic particle found in the nucleus of atoms (7)
  4. 4. - Minimum amount of any physical entity involved in an interaction (6)
  5. 6. - A subatomic particle of about the same mass as a proton but without an electric charge (7)
  6. 8. - Change of state from gas to liquid (11)
  7. 10. - Process used by plants to convert light energy into chemical energy (13)
  8. 11. - Study of genes and heredity (8)
  9. 12. - A substance that takes part in and undergoes change during a reaction (8)
  10. 14. Zero - Theoretical temperature point where motion ceases (12)
  11. 17. - A branch of science dealing with celestial bodies (9)
  12. 19. - A substance that has a molecular structure consisting chiefly or entirely of a large number of similar units bonded together (7)
  13. 20. - Systems of millions or billions of stars, together with gas and dust, held together by gravitational attraction (8)
  14. 24. - A protein that speeds up chemical reactions in the body (6)
  15. 30. - Emission of energy as electromagnetic waves (9)