The answer is D “Plaque can build up and prevent oxygen from reaching the brain”.
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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The answer is true. Originally, the Olympic Games consisted of fewer events than they do now. The original events included wrestling, discuss throw, javelin throw, running, chariot racing and some others. Much recent addition to the Olympic Games include table tennis and martial arts.
Answer:
Student slipping on the ice.
