Respiratory system

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Across
  1. 4. What is it called when you exhale air?
  2. 6. What are the bones that protect your lungs, and other muscles?
  3. 7. What is the area where are abs are called?
Down
  1. 1. What is the muscle used to breath in and out?
  2. 2. What do humans breathe to survive?
  3. 3. What are the hairs called in your nose to prevent sickness?
  4. 5. What is it called when you inhale air?
  5. 8. How does airflow gets into your nose?