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 Gas Exchange Respiratory Systems (Ch. 42) Why do we need a respiratory system? O2O2 food ATP CO 2...

Slide 1 Slide 2 Gas Exchange Respiratory Systems (Ch. 42) Slide 3 Slide 4 Why do we need a respiratory system? O2O2 food ATP CO 2 respiration for respiration Need O 2 in…