Freshwater can be renewed, but environmentalists consider it nonrenewable. why is there a contradiction in classification? a water is recycled through the use of irrigation, bathing, and everyday use. b water is easily polluted or depleted before it can be replaced. c water evaporates and condenses, and then precipitation returns it to the lakes. d water is highly affected by global warming, and is quickly evaporating.

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.