I was just thinking about this Mark Twain piece I read in high school about flies. It was meant to question the existence of God, but it got me thinking about ecosystems. In the piece, he wrote about all the bad things that flies do - eating at festering wounds and stealing our food - and said that there was no good use for a fly (and then came the question of why God would create something that is all bad and no good). So that's my question - what is a fly good for (in an ecosystems sense)?
I have my own theory, but I'm curious about what you all think.
EDIT: In case anybody's interested in the Mark Twain piece, it's called "Thoughts of God" and can be found 4 stories down on this atheism page
[LINK].