i) An example
ii) Two distinctive defining features: Reptilia and Chondrichtheyes?
i) Reptilia example: lizards
Chondrichthyes example: sharks
ii) Reptiles are cold-blooded four-legged vertebrates covered with scales. Reptiles use lungs for respiration though many of them spent most of their life in the water environment.
Chondrichthyes are marine fishes whose skeleton is composed of cartilage. The respiration occurs through gills that are not covered with a bone cover (operculum).