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They did not have the benefit of cheap, off the shelf, mass produced batteries. Bronze is a relatively hard alloy of copper and tin, better suited for the purpose than the much softer copper enabling improved durability of the weapons and the ability to hold a cutting edge.For many years the telegraph, and later the telephone, industries were the only consumers of batteries in modest volumes and it wasn't until the twentieth century that new applications created the demand that made the battery a commodity item. The use of bronze for tools and weapons gradually spread to the rest of the World until it was eventually superceded by the much harder iron.The term can also be applied to larger groups of organisms, as in "the adaptive radiation of mammals." adaptive strategies: A mode of coping with competition or environmental conditions on an evolutionary time scale.Species adapt when succeeding generations emphasize beneficial characteristics.Up until the late 1990s I had thought of people from the Caucasus mountains when I heard the term, but then I began to reorient my assumption because of its colloquial usage.

adaptation: Any heritable characteristic of an organism that improves its ability to survive and reproduce in its environment.

Then, even if circumstances change such that it no longer provides any survival or reproductive advantage, the behavior will still tend to be exhibited -- unless it becomes positively disadvantageous in the new environment.

adaptive radiation: The diversification, over evolutionary time, of a species or group of species into several different species or subspecies that are typically adapted to different ecological niches (for example, Darwin's finches).

Caucasian, literally, refers to people native to the Caucasus, but it has become interchangeable with any number of ‘White’ populations, most of wh1om trace their ancestry to Europe.

One gets the feeling that the term ‘White’ fell out of favor and was replaced by ‘Caucasian’ much like ‘Black’ was replaced by ‘African-American’.