Answer the following question given this paragraph: 

Symbiosis is a close relationship between two species in which at least one species benefits. For the other species, the relationship may be positive, negative, or neutral. There are three basic types of symbiosis: mutualism, commensalism, and parasitism.


Q: What is a close relationship between two species in which at least one species benefits called?

 Choices:

- parasitic

- morphogenesis

- competition

- symbiosis

A:
symbiosis
