Crossword Puzzle

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Across
  1. 4. process by which plants make their own food
  2. 6. system of the body that breaks down food
  3. 7. The body’s use of molecules for energy and growth
  4. 9. A molecule that organisms get from the air or water around them that they use to release energy
Down
  1. 1. system that brings in oxygen molecules and gets rid of carbon dioxide molecules
  2. 2. A group of atoms joined together in a particular way
  3. 3. a group of organs working together
  4. 5. A molecule that organisms can use to release energy, and is made of carbon, hydrogen, and oxygen atoms
  5. 7. organelle where cellular respiration happens (the powerhouse of the cell)
  6. 8. is the basic unit of an element that consists of protons, neutrons, and electrons.