Apr 16, 2011  · When thinking of the natural world, we often focus on the fight for survival, the battle of prey versus predator or the competition for available food or. Several well-known examples of mutualistic arrangements exist. The partnership between nitrogen-fixing bacteria and leguminous plants is one example. Endosymbiotic bacteria closely related to mammalian pathogens are widespread in invertebrates. Mutualistic and parasitic bacteria–host interactions on the various. Carbon is the…