Answer:
Xerophthalmia is a progressive eye disease caused by vitamin A deficiency. Lack of vitamin A can dry out your tear ducts and eyes. Xerophthalmia can develop into night blindness or more serious damage to your cornea, the outer layer of your eye.
Explanation:
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The lower the level of the pyramid, the more important the needs are. On the most bottom part, you will see physiological needs such as the need for food and water, for shelter and for warmth, while higher up at the top you'll see things such as being esteemed as someone great or being successful at what you do. Those thing are higher because they rare less important for us than physiological needs.
Various tissues if organs look under each other under a microscope.
