Levels of organisation.

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Across
  1. 3. a group of organs working together to perform certain functions
  2. 5. the system which transports oxygen and nutrients to the rest of the body using blood
  3. 8. the system that takes oxygen from the air and puts it into the blood
Down
  1. 1. the system that breaks food down and absorbs the food into the blood
  2. 2. the basic unit of life
  3. 4. a group of different tissues that work together to perform a certain function
  4. 6. a group of cells the work together to perform a certain function
  5. 7. a group of organ systems working together