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.
Low levels or lack of Vitamin A in a human body causes Vitamin A deficiency and it is the number one cause of what is known as preventable blindness in children and severe visual impairment.reatment of Vitamin A Deficiency. Vitamin A deficiency can be treated if the state has not worsened for which early diagnosis matters a lot. 1  A diet which is rich in Vitamin A is usually the treatment and the best prevention method of vitamin A deficiency.