Evolution is only a theory and is extremely improbable

Without saying whether it is true or not, describe the observable evidence for evolution creating brand new, complex functionality such as a wing?

Phoebe is actually correct. Evolution is extremely improbable.

For more information see

https://www.sott.net/article/418052-The-Probability-of-Evolution

QUOTE
"One of the most crucial questions in regard to the probability of evolution is: What are the chances of randomly creating a nucleotide sequence that will produce a chain of amino acids that will fold into a protein able to perform a job? Douglas Axe spent a lot of time figuring out the answer. According to his research, for a sequence of 150 amino acids, only one such sequence out of 10^74 would fold. One out of 10^77 (1 with 77 zeros) possible sequences will be able to do the required job. The number of atoms in the whole universe is estimated to be about 10^78-10^82, so this is close. To imagine what this means, think of it this way. Out of all possible 150-amino-acid sequences, the chance to randomly get one that works is about the same as if you and I got teleported to two random places in the whole Universe, and we would meet. Not going to happen. And this is just the probability to make one relatively short protein."

Notes:
Each cell in the human body has 20,000 different proteins.