Question 13 What happens to water after it undergoes infiltration?

a
It flows across the land into rivers or the ocean.
b
It is held in the bedrock of the area until it flows to an opening to the surface or is pumped up through wells.
c
We cannot know where it goes.
d
Only plants can reach water after infiltration.

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.