reply to post by supertrot
I have never understood the theory of evolution as you described.
In a sense, it is a one way street in that as time moves forward, the species changes. Mutations produce an organism that functions differently from
its progenitors. Viability, of course, is then determined by the environment and circumstance.
Whether new genes (or combinations thereof) are produced by mutation or inheritance is immaterial to the basic function of the process.
I think it is highly unlikely that evolution routinely produces what could be considered a reversion to a prior species. The variables in play are
simply too numerous for that to occur even over the course of millions of years or in unchanging environments, imo.
Notwithstanding, change routinely occurs in species. It does not take global environmental change for this to happen.
edit on 30-7-2012 by loam because: (no reason given)