Which of the following pairs does NOT represent a symbiotic relationship?

Explanation

Symbiosis involves a close and long-term biological interaction between two different species. Rhizobium bacteria with legumes, fungi with algae in lichens, and mycorrhizal fungi with tree roots all exemplify symbiotic relationships. However, the sporophyte and gametophyte of Marchantia are different life stages of the same organism, not separate species, so their relationship is not considered symbiosis.