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4 Answers
- Anonymous1 decade agoFavorite Answer
It's speculative, of course.
http://en.wikipedia.org/wiki/Swim_bladder#Evolutio...
My gut feeling is that the swim bladder did evolve from a lung. Also, you'll notice that the marine fish that have the swim bladder are hypotonic with respect to the marine environment -- suggesting that those marine fish had a freshwater (or possibly brackish) ancestor. This means that there's an ancestor that lived close enough to the surface of water to be gulping air.
- Anonymous1 decade ago
They didn't...
It is likely lungs evolved from swim bladders though.
- 1 decade ago
well, swim bladders are not in fish and things that are not fish need oxygen to live, Hint* the lungs* so thats why swim bladders came after lungs
- Anonymous1 decade ago
'Cause the scientists say so.
Don't question science!
