<human>:  What are some of the similarities between a river and an ocean?
<bot>: Some of the similarities between a river and an ocean include that both contain water and numerous species of plants and animals, both serve as habitats for many different species, and their bodies of water are connected and affect each other's ecosystem. They both experience tides, although the tides in a river are much more subtle. Additionally, both a river and an ocean provide an important source of recreation and transportation for humans.