The frog has two ways of getting enough oxygen every day. Through their young age the frogs have water breathing gills until metamorphosis takes place and they form lungs to breath air. The frogs have external nares and pharynx which help them receive the air that fills their lungs. Along with their gills or lungs, the skin of the frogs is an absorbent respiratory surface. Their skin absorbs more than 25% of their daily oxygen and therefore intervenes with the gills or lungs and external nares to help the frog receive the necessary amount of oxygen to survive. 
Great image! Can you put the URL in the comments? What are the two systems? What problem are the two systems integrated to solve?
ReplyDeletehttp://www.thefrog.org/images/biology/breathing.gif
DeleteThe systems are the gills/lungs (depending on the stage in the frogs life), the external nares, the pharynx, and the skin. The systems integrate to help the frog receive the necessary amount of oxygen to survive.
So are the lungs / gills part of the respiratory system? Circulatory system? Function of O2 more specifically? Think of a very important chemical reaction and what it does at the very end of the process...
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