Wednesday, April 7, 2010
Why Do Fish Still Exist?
Coyne frequently references organisms evolving to better their chances of survival. A prime example of this is the evolution of fish into reptiles and reptiles into mammals, but if environmental stress variables forced water-based species to evolve to a more land-based life, why do fish even exist anymore? Wouldn't they have all evolved and followed a similar path of evolution as their reptilian relatives? In addition, reptiles coexist with fish in many areas where environmental stress variables once forced fish to evolve into reptiles to survive. If, going by the definition of evolution, a species' inability to evolve will lead to its death, then why is it that fish managed to survive stress variables in the same location that some of them actually evolved into reptiles?