Symbiosis

/ˌsimbīˈōsəs,ˌsimbēˈōsəs/

Noun

1. (in biology) the close association of two different organisms, which may benefit both, benefit only one, or sometimes have little effect on either

Nature is extraordinarily tough and resilient, interlaced with checks and balances, with an astonishing capacity for recovering from disturbances in equilibrium — the formula for survival is not power; it is symbiosis. 

- Sir Eric Ashby (1904-1992)

2. a collaboration where two persons, groups, or things work together in concert

There is a natural symbiosis between paleontology and construction, both professions where digging in the dirt is part of a day’s work.

- “When Fossils Are Accidentally Dug Up, the Job Site Becomes a Science Lab”, The New York Times