How would you expect the iguanas to look many years after the island flooded and food became harder to find?

NO IT ISB)There would be more iguanas with webbed feet and flat tails.

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.