4 examples of symbiosis in sentences

And is it possible to stop this process of decay without finding some form of civil symbiosis which will ensure for all men a more human mode of living?

The result of the three centuries that had passed was a symbiosis between the urban aristocrats and the country-people.

From this symbiosis there began to be formed a new people, the so-called T'u--hun, a hybridization of Mongol and Tibetan stock with a slight Turkish admixture.

Japan had for centuries had a middle class (the merchants) that had entered into a symbiosis with the feudal lords.

4 examples of  symbiosis  in sentences