Vitamin <u>A</u> is necessary for vision, bone growth, and maintenance of epithelial cells.
We can define vitamins as micronutrients that perform various important functions in the body. Vitamins cannot be synthesized by the body of a person and hence are derived from the diet of a person.
Vitamin A is present in many foods and it is a fat-soluble vitamin. Vitamin A helps the body in various functions such as improving vision, helping the immune system, growth of bones, maintenance of cells etc.
Certain foods contain carotenoids in them. A person's body has the ability to convert these carotenoids into Vitamin A which is then used by the body for various functions. Some preformed sources of Vitamin A include dairy products and eggs.
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Because the gram stain differentiates two types of bacteria based on the composition of their cell walls.
<span>Rattlesnakes would eat a prairie dog if they could catch it. However, if a rattlesnake approached a prairie dog colony, the prairie dog's "sentinels" would alert the rest of them, and they would hide in their holes. A rattlesnake could fit into the holes, but I don't think that snakes usually actively seek prey (they act more like a trap, waiting for prey to come to them). </span>
