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.
Overview. Vitamin A is a fat-soluble vitamin that has several important functions in the body. 1  It helps cells reproduce normally, a process called cellular differentiation. 2  It is essential for good vision.3  It is needed for the proper development of an embryo and fetus.verview. Vitamin A is a fat-soluble vitamin that has several important functions in the body. 1  It helps cells reproduce normally, a process called cellular differentiation. 2  It is essential for good vision.