Mutualism is a symbiotic relationship in which both species benefit. Commensalism is a symbiotic relationship in which one species benefits while the other species is not affected. Parasitism is a symbiotic relationship in which one species (the parasite) benefits while the other species (the host) is harmed
Symbiosis is a close relationship between two species in which at least one species benefits.
Mutualism is a symbiotic relationship in which both species benefit.
Commensalism is a symbiotic relationship in which one species benefits while the other species is not affected.
Parasitism is a symbiotic relationship in which one species (the parasite) benefits while the other species (the host) is harmed.
I believe that you are needing to pick from the three word choices. I believe the first one would be fact and the second one would be conduct experiment.