What is a common characteristic of organisms in a mutualistic relationship?

In a mutualistic relationship, both organisms engage in an interaction that provides benefits to each other, which is the hallmark of this type of symbiosis. For example, consider bees and flowering plants; bees obtain nectar from flowers for food while simultaneously facilitating the pollination of the plants, which enhances their reproductive success. This reciprocal benefit is what distinguishes mutualism from other ecological interactions, such as parasitism where one organism benefits at the expense of another or competition where organisms vie for limited resources.

The nature of mutualistic relationships can vary in complexity, ranging from simple interactions to intricate partnerships, but the fundamental aspect is that both parties gain from the relationship. This characteristic reinforces their sustainability and often leads to co-adaptation over time. Therefore, the correct answer highlights the essential nature of mutualism as a relationship where both organisms benefit.