This document discusses comparing and contrasting by showing similarities and differences. It provides an example of comparing frogs and ducks, noting they both hatch from eggs and make noises, but frogs use their back legs to swim and hibernate in winter while ducks use webbed feet to help swim and move to warmer weather in winter. It also contrasts two boys, Gary and Luis, showing Gary talks a lot and is messy while Luis is neat and quiet, but they both play baseball and like jokes.