Killed A Lot Of Americans. (4)
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No best answer has yet been selected by Waterwolf. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.As Geofbob said at the start it depends on the beginning environment of the species. However he says it as though the elements on the planet they live on are the same as Earths. Electricity on a far off world may be solid and easily mined. A new compound made of elements not found on Earth may be more efficient. There may be an even higher organism on the planet affecting the environmental one. The planet may have evolved in such a strange way due to its environment they may be not other animals on it to be affected. All these points must be taken into concideration before creating a possible answer.