When the skin is exposed to ultraviolet rays, the skin produces a molecule that is turned into Vitamin D.
Sun is the source of ultraviolet rays important for Vitamin D production. Due to this reason, in the case of Vitamin D deficiency, it is recommended by doctor's to absorb sunlight by skin. The Vitamin D production occurs specifically by UV B rays rays which lie in the range of 290-315 nanometer.
The chemical 7-dehydrocholesterol absorbs these rays and convert to previtamin D3. Further, previtamin D3 isomerizes to Vitamin D. Other than sunlight, Vitamin D can be taken through diet. The sources include seafood like fish, fish oil, dairy products, beef liver etc. Vitamin D is required for bone and teeth formation, muscle contraction, immune system etc.
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Answer:
Any iron or metal cleaning
I agree with what you answered
False, because even if you do get the shot, it wont fully protect you.
Answer:
Option (d).
Explanation:
The individuals generally responses to the sudden noises and like to listen the noise that are pleasant to their ear. They develops a type of learning or memory against that noise.
Michelle has put on the headphones and listen white noise. She always click the button on listening the noise. She is more likely to develop the more false alarm that activates when she listen to that noise. She has developed a kind of response against the white noise.
Thus, the correct answer is option (d).
