Create the setting of a planet where the species that inhabits it is a species o

Create the setting of a planet where the species that inhabits it is a species of aquatic human that evolved to live in marine or coastal environments.. They developed adaptations such as interdigital membranes, Greater lung capacity and the ability to metabolize oxygen dissolved in water. Extraterrestrial living in the place, a description of the anatomy of each species and the animals and vegetation of the place. That species have biological logic. And they are based on an evolutionary theory.