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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<span><span>The answer is C. Urethra.
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The urethra is connected to both the urinary and reproductive system in males. It is a tube that transport urine and semen (with sperm) outside the body. The opening of the urethra is found on tip of the sexual organ. The urethra connects to the seminal vesicles of the reproductive system. It connects to the bladder of the urinary system. </span></span>
Answer:
B
Explanation:
The changed protein connects differently, but its function doesn't change.
Answer: 2. Briefly describe an experience in your life with an effective leader. Include the traits, characteristics or mannerisms they displayed that made them effective. Provide some examples to support. (5 points)
