Since there is an intense competition, it will be best we introduce the rule of the survial of the fittest. This is an attempt at rooting out any organism which can not survive the new situation while the survivor are saved. though the promotion is more of a natural order than a model.
It was built on an island in the middle of a lake. The Aztecs built causeways, or raised roads across water or wet ground, so people could access the city.
