Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
A mutualistic relationship is a type of symbiotic relationship where both species involved benefit from their interaction. Each organism provides something the other needs, such as food, shelter, or protection.
Related terms
Symbiosis: The close and long-term interaction between two different species living together.
Obligate Mutualism: A type of mutualistic relationship where the survival of one species depends entirely on the other.
Facultative Mutualism: A type of mutualistic relationship where both species can survive independently but choose to interact for additional benefits.