Although they may appear similar, frogs and toads are two distinct creatures. Both animals are amphibians that lay eggs and begin their life in water. However, frogs need to keep their skin continually moist, so they live most of their lives around water. ______, toads can live in dry places like deserts. Reliance on water also shapes a frog’s legs, which are long and give frogs the ability to swim. In contrast, toads have shorter legs which give the animal a round and squat look.
The addition of which transition to the blank would best help accomplish the author’s goal?