MadSci Network: Evolution

Subject: Why didn't mammals evolve with lungs and gills?

Date: Mon Mar 27 09:58:02 2000
Posted by Mike DeLuca
Grade level: grad (non-science) School: Va Tech
City: Boca Raton State/Province: FL Country: USA
Area of science: Evolution
ID: 954172682.Ev

It would seem that evolution should have produced a large number of 
species that can breath both air and water. The advantages in finding food 
and adapting to changing environments would seem to give a species with 
such a combination major advantages. Yet only a few amphibians have such 
attributes! Is there a good reason why larger more complex creatures did 
not evolve to breathe both air and water? (And I wish I could scuba dive 
without air tanks.)

Re: Why didn't mammals evolve with lungs and gills?

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