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 Vitamin A is also important to maintaining healthy skin and it helps the body to resist infection. 2  Benefits of Vitamin A Vitamin A is important for the immune system, and it keeps skin and mucous membrane cells healthy.3  Vitamin A helps to fight cancer by inhibiting the production of DNA in cancerous cells. Foods That Contain Vitamin A Vitamin A can be found in both animal and plant foods. 2  It is found as retinol in animal foods and as carotenoids in plant foods. 3  These are compounds the body can convert into vitamin A. The single best source of vitamin A is liver.