Science crossword puzzle

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Across
  1. 1. a mixture where one substance dissolves into another, not easily separated
  2. 5. makes food through photosynthesis
  3. 7. the regular rise and fall of the ocean surface level
  4. 8. the process of going from liquid to gas
  5. 9. animals that do not have a back bone
  6. 11. a straight path of light
  7. 12. animals that have a back bone
  8. 16. the bending of light
  9. 17. the highest point of a wave
  10. 18. produces the egg
  11. 19. soak up water and nutrients; anchors the plant to the ground
Down
  1. 1. supports plant; has water to move throughout plant
  2. 2. protects the bud before the flower blooms
  3. 3. a combination of humor things that can be easily separated
  4. 4. a river of water that flows through the ocean
  5. 6. make pollen, attract pollinators
  6. 10. a substance that cannot be broken down anymore, made up of one type of atom
  7. 13. the lowest point of a wave
  8. 14. light goes through an object
  9. 15. the number of wavelengths that pass through a good employee make per second