Documents AP Biology 2008-2009 gills alveoli elephant seals Gas Exchange Respiratory Systems.

Slide 1 Slide 2 AP Biology 2008-2009 gills alveoli elephant seals Gas Exchange Respiratory Systems Slide 3 AP Biology Slide 4 Why do we need a respiratory system? O2O2 food…

Documents AP Biology Why do we need a respiratory system? O2O2 food ATP CO 2 Need O 2 in for aerobic...

Slide 1 Slide 2 AP Biology Why do we need a respiratory system? O2O2 food ATP CO 2  Need O 2 in  for aerobic cellular respiration  make ATP  Need CO 2 out …