15.

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Across
  1. 3. working quickly and effectively with a minimum waste
  2. 4. the use of living cells, bacteria, etc. to make useful products
  3. 10. to move forward; to become better or more developed
  4. 11. to discover an amount or number using mathematics
  5. 13. something good about a situation that helps you
  6. 16. the scientific study of natural forces, such as energy, heat, light, etc.
  7. 18. one of the simple, basic parts of something
  8. 19. a part of a cell that is passed on from a parent to a child
  9. 20. to find the answer to something or to stop a problem
  10. 22. to try to find someone or something
  11. 23. a particular way of doing something that requires skill
  12. 25. advanced scientific knowledge used for practical purposes
  13. 27. a room used for scientific work
  14. 28. to show that something is true
Down
  1. 1. to succeed in doing something good, usually by working hard
  2. 2. to show the image of something on a surface
  3. 4. the study of living things
  4. 5. to separate people or things into smaller groups or parts
  5. 6. to study something closely and carefully
  6. 7. to try to do something, especially something difficult
  7. 8. a particular type of liquid, solid, or gas
  8. 9. a machine or piece of equipment that does a particular thing
  9. 11. the scientific study of substances and how they change when they combine
  10. 12. the study of a subject in order to discover new information
  11. 14. the smallest unit that an element can be divided into
  12. 15. to affect a particular person or situation
  13. 17. to design or create something that has never existed before
  14. 21. to change something to suit different conditions
  15. 24. a test to try out a theory or to see the effect of something
  16. 26. a way of doing something