The question comes up, "why do humans create an ever exspanding world which suites only people?' The answer is, all organisms do and at all times. Weeds invade our perfect lawns. Argentine ants are over taking native Californian ant populations. House flies buzz over 13,000 feet of Mauna Kea, Hawaii. (http://www.ifa.hawaii.edu/mko/telescope_table.htm) Sometimes this exspansion is somewhat benign and many times it is not. Sometimes the exspansion can in a short time, geologically, change the entire world. (http://www.gps.caltech.edu/users/jkirschvink/)
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