Answer:
oh wait i got confused yea what the person below me said
Ybor City. It’s a city Neighborhood in Tampa,FL
The theory developed based on observations made on the Galapagos islands was, Natural Selection.
I hope I helped you!
Source: https://socratic.org/questions/which-theory-was-developed-based-on-observations-made-on-the-gal-pagos-islands