That is why stem cell research is imperative
Scientists are having to rethink evolution....which could perhaps even explain the 'missing link'...something triggers DNA to 'switch'..(.they are also trying to figure out what switches the cancer gene to turn on...and the clock begins to tick...)
There is an eel like fish(do not know the name)...that exists with Trout...they have developed hind legs so that they can escape the Trouts' mouth quickly and forcefully. The exact same eel like fish, that exists in other parts of the country, has only fins.
It was on The Discovery Channel.