It really depends, think of it as 2 light bulbs in each parent. if both light bulbs in both parents are switched on that means their genes that they inherited are only able to have brown eyed babies, although if just 1 of the 4 light bulbs are not on it allows the baby to have blue eyes.
The Cleveland clinic says that allergies are the main cause for the high levels. But some other causes can include skin disorders, tumors and autoimmune disorders
This is rlly nice thanks hope you are also doing well :)
2nd 5th and 1st one i think
