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
Camisa is a shirt in English , camiseta is t-shirt.Camiseta is usually used in central-America.
Yo (prefiero) la primavera.