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.
Cancel. Vitamin A is a group of different compounds that helps the body fight infection, improve vision and maintain skin health. Discover the benefits of vitamin A with tips from a licensed dietitian in this free video on nutrition.Part of the Video Series: Nutrition Tips.ancel. Vitamin A is a group of different compounds that helps the body fight infection, improve vision and maintain skin health. Discover the benefits of vitamin A with tips from a licensed dietitian in this free video on nutrition.