Final answer:
Commensalism is the term used for a symbiotic relationship where one organism benefits and the other is neither harmed nor helped.
Step-by-step explanation:
The term used for a symbiotic relationship in which one of the organisms benefits and the other is neither harmed nor helped is commensalism. In commensalism, one species benefits while the other species remains unaffected. This type of symbiotic relationship is characterized by one-sided benefit, where one organism gains an advantage without causing any harm or providing any benefit to the other organism.
For example, barnacles attaching themselves to the skin of whales and benefiting from their movement and access to food is an example of commensalism.