A partnership between organisms that helps one or both of them survive is called symbiosis.

There are three main types of symbiosis:

* Mutualism: Both organisms benefit from the relationship.

* Commensalism: One organism benefits, while the other is neither helped nor harmed.

* Parasitism: One organism benefits at the expense of the other.

Let me know if you'd like me to elaborate on any of these types of symbiosis!