Unit 3

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Across
  1. 5. an organism that eats food for energy
  2. 7. related items that regularly work together
  3. 8. a gas produced by animals during cellular respiration that plants use for photosynthesis
  4. 10. an organism that breaks down waste for energy
Down
  1. 1. the process plants go through to make glucose
  2. 2. a substance plants make and store for themselves during photosynthesis and eaten by animals for food
  3. 3. a gas produced by plants during photosynthesis that animals use for cellular respiration
  4. 4. a substance taken in by plants during photosynthesis and released by animals during cellular respiration
  5. 6. a single piece of an element
  6. 8. a sequence of events that repeats itself
  7. 9. an organism that makes its own food for energy