Can you plz help me answer this question? I am taking an exam!

Aplant may open end close its stomata to prevent excess water loss and maintain

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.

How do all types of diffusion/passive transport actually ‘work’ without using even the smallest amount of cellular energy?