[ QUOTE ]

Sounds awfully saltationist to me. Better elaborate before somebody pipes up with the old "but what use is half an eye?" silliness. [img]/images/graemlins/wink.gif[/img]

[/ QUOTE ]

That was just an example off the top of my head. Eyelids aren't necessary for eyes though, snakes don't have them. Practically all of our physical traits are there as a result of genetic adaptation at some stage in our history.