Final answer:
The term describing a relationship where both organisms benefit is called mutualism, which is a type of symbiotic relationship.
Step-by-step explanation:
The term used to describe when both organisms benefit from and depend on one another to a certain extent is known as mutualism. This is a type of symbiotic relationship where each of the coexisting species gains a benefit. For example, bees and flowers have a mutualistic relationship; bees get nectar from flowers for food, and in the process, they help in the pollination of the flowers.
Mutualism is one of the three basic types of symbiosis, which also include commensalism (one species benefits while the other is unaffected) and parasitism (one species benefits and the other is harmed).