mishra's crossword

123456
Across
  1. 2. where oxygen comes in the body best
  2. 4. the windpipe
  3. 5. the outer part of the respiratory system
  4. 6. a spongy organ that sits inside your ribs
Down
  1. 1. where food and oxygen comes in the body
  2. 3. the muscle just below the lungs