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bird evolution

Hello everybody!!

I am giving a senior seminar presentation and have a question about the
bird/dinosaur debate.
And I don't recall this question being asked about the birds and dinosaurs
before....so here it goes...

How did the arms of a theropod dinosaur evolve into the wings of an ancient
bird if birds are thought to be the descendants of dinosaurs?  Anatomically,
I cannot picture how this evolution took place.  Is anybody able to help
explain this to me?