Carbon monoxide

12345678
Across
  1. 2. To take notice of advice
  2. 3. hydrocarbon fuel
  3. 5. When a machine or system fail to work properly
  4. 7. The breathing and heart systems of animals including Humans
  5. 8. To breath in
Down
  1. 1. poisonous gas made when combustion reactions are incomplete
  2. 2. A vision or experience that is not real but can appear to be real
  3. 4. To have air circulating and refreshed regularly in an inclosed space such as a room
  4. 6. An official person who makes decisions on how and why people have died