You are an oxygen molecule floating in the air near a rabbit about to pass into its nasal passageways. tell the story of your adventure through cellular respiration of the rabbit and then photosynthesis in a plant.

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.