Some of the earliest important examples of symbiosis—the close cooperation of two or more living things—occur in island communities. | Symbiosis—the close cooperation of pairs or small groups of living organisms—is especially important in these island environments. | The first organisms on these islands worked together closely in a relationship known as symbiosis, which is particularly important on islands. | It is significant to note that organisms in the beginning stages of the development of island life cannot survive without close cooperation. |