Low PH definitely causes rashes. This is because the water turns slightly acidic.
As for chlorine, only high chlorine will cause a rash. If there is too little chlorine the water will not be as clean as it should be, but it won't cause a rash.
cadmium can cause loss of the ability to smell at low levels
Low estrogen levels are known to cause delayed breast growth in teenage girls, but is not the only cause.
low copper levels
yes.
I'd be willing to bet you are doing a case study for a biology class
Low oxygen levels cause vasodilation in systemic arterioles.High oxygen levels cause vasodilation in capillaries in the lungs.
No
yes
yes
Yes
It means your iron levels are low. If can cause dizziness and fatigue. You should take extra iron and seek to address the cause of the low iron.
Yes, it can. The low sugar levels cause you brain to malfunction.