Multiple choice Commensalism is a symbiotic relationship in which what occurs between the organisms? both are harmed one benefits, the other is unharmed one benefits, the other is harmed they compete Reveal answer Fill a bubble to check yourself B Correct answer Explanation Commensalism is defined as a relationship where one organism benefits from the interaction, while the other organism is neither helped nor harmed (unharmed). If both benefited, it would be mutualism; if one was harmed, it would be parasitism.