The answer is B? I think at least.
The correct answer for the first blank space is A. Was completed in 2003.
I do not know what it could be for the second blank space, but I think it is C. Provides information that will allow people to genetically alter their appearance
Answer: Circuit training builds your aerobic, or cardiovascular, endurance, too! “Your cardiorespiratory system has to work harder to keep up with the relentless demand for energy from your working muscles as you perform back-to-back exercises,” he says.
Explanation:
