To the north are the Chukchi and Beaufort seasâthe southern parts of the Arctic Ocean. The Pacific Ocean lies to the south and southwest. Alaska is the largest state in the United States by area, the 3rd least populous and the least densely populated of the 50 United States.
Vitamin A deficiency (VAD) is a lack of vitamin A in humans. It is common in poorer countries but rarely seen in more developed countries.Nyctalopia (night blindness) is one of the first signs of VAD.revalence of vitamin A deficiency. Vitamin A deficiency (VAD) is a lack of vitamin A in humans. It is common in poorer countries but rarely seen in more developed countries. Nyctalopia (night blindness) is one of the first signs of VAD.
1 A diet which is rich in Vitamin A is usually the treatment and the best prevention method of vitamin A deficiency. 2  Liver, kidney, milk, cheese, cream and butter are rich sources of Vitamin A. Vitamin A can also be absorbed in the body through Carotene which is found in vegetables which have dark green vegetables. Mal-absorption of vitamin A by the body can also lead to its deficiency. 2  It can be due to sprue, celiac disease, obstructive jaundice, cirrhosis, giardiasis, cystic fibrosis or an over use of mineral oil as laxative. 3  Over excretion of urine is also known to cause Vitamin A deficiency.