Water that is on the Earth today is the same water that was here when the Earth began. This is possible because of recycled water, both naturally occurring and as a result of human technology. The Earth naturally reuses its water; however, water recycling in the human population uses technology to speed up the process through practices like reusing waste water for purposes such as irrigation, flushing a toilet or filling up a groundwater basin. Recycling wastewater is the only way to avoid future water shortages and decrease the damage water pollution is doing to the environment.Which one of the following, if true, most strengthens the argument?