Inhaling oxygen
1.what is the primary purpose of the respiratory system?
= The primary purpose of the respiratory system is to bring oxygen to the lungs and remove any unnecessary gases.
2. where does this exchange to occur ?
= this exchange to occur does from the mouth to the lungs for breathing.
3. who is those breathe through gills ?
= those breathe through gills is fish.
4. Do they breathe through skin ?
= No, they don’t