yes
Yes it can.
it doesn't, in fact war is blamed for two cooling periods. Massive bombing can cause increased dust, which in turn is blamed for increased albedo. This increase in albedo can cause cooling temporarily.
Many factors can influence the menstrual cycle. Stress, diet, and exercise can cause irregular periods. Hormone imbalances can cause them too.
Heavy exercise in general can mess with your periods, regardless of how you exercise. Usually through delaying them or in extreme cases cause them to cease entirely. Anyhow your body isn't clockwork perfect, and periods can shift a bit for no obvious reason.
Regular exercise has been known to cause lighter, more regularly timed menstrual periods. It also helps to reduce/eliminate the symptoms associated with PMS.
Rapid respiration can be caused by breathing difficulties, increased need for oxygen due to exercise or from pain.
Body cells get oxygen and food from blood. So, faster breathing causing increased oxygenation and increased heart rate cause greater blood flow during exercise.
Exercise, sexual arousal, and embarrassment can all cause increased blood flow to different parts of the body. Increased blood flow to the digestive organs happens after a meal.
Yes, an increase in exercise can cause your periods to stop. If you are sexually active you should take a pregnancy test to make sure you are not pregnant but otherwise you can relax if you have increased your level of exercise and your periods stop or decrease dramatically.
Yes, the copper IUD (intrauterine device), brand-named Paragard in the US, can cause irregular periods, heavier periods and increased cramps. These side effects are more common in the first six months after the IUD is inserted. The Mirena IUD, which contains levonorgestrel, may cause irregular periods in the first months of use, but over time you can expect fewer periods and less bleeding.
Increased ground level ozone can cause problems. It is a pollutant.
Any prolonged periods of oxygen deprivation result in increased Red cell production ... but the best way to do that is to live on a mountain. But people who work (out) hard (doesn't need to be in sports) get an increased blood volume.