658 



Metamorphosis 



There appears to be a limited repertoire of 

 physiological mechanisms by which living 

 things can meet a given problem. Both in- 

 sects and amphibians were presented by a 

 common evolutionary challenge, to evolve 

 a metamorphic stage transitional between 

 a larva with one mode of life and an adult 

 with another. Both organisms have evolved 

 closely analogous physiological mechanisms 

 to meet this challenge. 



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