Why don't you ever look anything up yourself?<quoted text>
So where does the "eye spot" come from?
It just "appears"?
An eye spot is merely a concentration of nerves. The earliest eye spot would have been merely a inheritable statistically significant increase in the number of nerves in one part of the body. So is it that difficult to see that the first one was only a random slightly higher concentration and that trait was passed on?
Perhaps instead of asking questions of us that you are stupid enough to think that there is no answer to you could Google search it first. That would save us time and you embarrassment.