The phrase 'exists side by side' can be replaced with a range of synonyms which convey the same meaning. Examples include 'coexist', 'exist together', 'occupy the same space', 'share space', and 'reside alongside'. Other popular synonyms include 'exist in harmony', 'live in concert', 'dwell in proximity', 'sit in parallel', and 'be concurrent'. All these synonyms imply that two or more things exist in the same area or space, without negatively impacting each other. They can be used in a range of contexts such as describing ecosystems, social interactions, or even inanimate objects and structures.