The word for today is…
symbiosis (noun):
1: the living together in more or less intimate association or close union of two dissimilar organisms (as in parasitism or commensalism)
2: a cooperative relationship (as between two persons or groups)
Source : Merriam -Webster
Etymology : Symbiosis was adopted by the scientific community in the late 1800s, coming ultimately (via German) from the Greek symbí?sis, meaning “living together, companionship.” Of course, there are a lot of ways to live together and, accordingly, several flavors of symbiosis. When a biological symbiosis between two organisms is mutually beneficial, it is termed mutualism. For example, oxpeckers are birds so named because they “peck” ticks off of infested cattle and wild mammals, a likely satisfying arrangement for both parties, and textbook mutualism. When one organism lives off another at the other’s expense, however, it’s called parasitism.
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