Why haven't we observed mutations of new body parts?

In order for a single celled organism to evolve into fish, amphibians, birds, mammals, and eventually, man over millions of years, new body parts have to emerge.Why haven't we seen a single instance where a new body part has been introduced? (not duplication of body parts)A Body Part is any part of an organism, such as liver, lungs, stomach, leg, finger, etc.A new body part is any body part that was introduced to an organism that was not there before, either in the organism itself or the entire population of that particular species.To my knowledge, I don't know of any instances where this has been observed, either directly or indirectly.Edited by Forever, : No reason given.Edited by Forever, : No reason given.

Welcome aboard Forever.In order to get threads started well and to keep then focussed we like to spend a bit of time making sure the OP (opening post) is clear.Since we also get a number of people who pretend to be asking questions but are not the least interested in learning anything we like to see someone put some effort in to demonstrate good faith.I think this will make a good topic of discussion so let's flesh it out a bit and get it going.You may edit the message one and then post a reply to this message to let an admin know you think it is ready for another look.To make the discussion get going smoothly I'd like you to explain why you think that there is not been an instance of a new body part.I'd also like you to define your terms. In other words, what would you count as a "new" "body part"?What do you mean by "seen"? This may sound silly but there are some very silly people here who think that only eye witness accounts mean anything. Of course, I'm sure you understand from the psychological work done how unreliable they such accounts are and are also aware that it is extremely common that we confidently make inferences by observing things without seeing them. It wouldn't hurt if you clarify all that though.Thanks.

I edited the OP.

Thread copied to the Why haven't we observed mutations of new body parts? thread in the Biological Evolution forum, this copy of the thread has been closed.