year 9 biology

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Across
  1. 3. the transfer of gasses from high to low concentration
  2. 5. the blood vessel that carries blood from the heart to the rest of body (oxygenated blood)
  3. 6. chemical and "blank" are the two types of digestion in the digestiev tract
  4. 7. the main structure in the respiratory system
Down
  1. 1. the structure in the respiratory system that is in charge of gas exchange (looks like a raspberry)
  2. 2. the first structure of the digestive track
  3. 4. the first section of your research investigation