Enviromental because it has to do with pollution.
B. Kefauver-Harris Amendment
The answer your looking for is D) marijuana, but in my opinion this is not factual.
A) to gain insight on your health to improve it more
Swimming is an efficient way to burn calories. A 160-pound person burns approximately 423 calories an hour while swimming laps at a low or moderate pace. That same person may burn up to 715 calories an hour swimming at a more vigorous pace.
Also Swimming cardio is one of the most effective ways to lose weight including your belly fat. This requires you to keep swimming for 15-20 minutes at the time while maintaining your heart rate levels in the particular zone that we call – fat burning zone.
