I was amazed to learn that there are different types of symbiotic relationships.
There is “mutualism” where both participants in the relationship benefit.
The most common example is bees and flowers as the bees barter their pollen carrying capabilities for the flower’s nectar. Another common one is the bacteria in our digestive systems. They keep our tummies balanced in exchange for living in a bacteria-friendly environment. The other types of symbiosis seem somewhat unfair. “Commensalism” is a one-sided symbiotic relationship. “Parasitism” is where one species depends on a host. Relationships in which organisms compete for resources are called “competitive”. The worst experience in a symbiotic relationship is to be on the wrong side of one called “predation and herbivory”, where one becomes food for the other. Human relationships can be symbiotic as well. The world’s “oldest profession” can be looked at as mutually beneficial unless an angry spouse or law enforcement intervenes, then it no longer benefits anyone. My last girlfriend and I were certainly in a parasitic symbiosis as she left me broke and almost destitute. After that, I had to enter a commensal symbiotic relationship with my sister and her husband as my “host” in their spare bedroom. Symbiosis gets more complex when machines are involved, especially a home’s HVAC system. It has a bit of mutualism to it. My HVAC benefits when I keep it cleaned and maintained by a qualified HVAC technician and I benefit by having year-round comfort. There is no competitiveness between my HVAC and myself, but I will admit that it’s a bit one-sided or commensal. The only time I feel like I am again on the wrong side of a parasitic relationship is when I fail to change the filters regularly and my utility company bill begins to rise.