“The majority of viruses, however, live symbiotically or mutualistically with their hosts, causing no harm.”
“Photosynthetic eukaryotes later originated when cyanobacteria incorporated mutualistically into an existing eukaryote line.”
“Termitomyces mushrooms are mutualistically associated with fungus-growing termites, which are widely considered to cultivate a monogenotypic Termitomyces symbiont within a colony.”