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.
Learn more about Vitamin D -
brainly.com/question/4551554
#SPJ4
I believe the best option for you to pick will be option C)
Answer: NATO and the Warsaw Pact were two competing alliances during COLD WAR time period.
Explanation:
Cold war was an era that started immediately after the second world war.This was to be a long lasting and continuing confrontation between the Soviet Union and the United States, lasting from 1945 to 1989. It was called the Cold War because neither the Soviet Union nor the United States officially declared war on each other.
The two major cold war alliances were the NATO (North Atlantic Treaty Organisation) and the Warsaw Pact. The countries that make up the NATO includes Britain, France, the United States, Canada, and eight other western European countries while Warsaw pact was created by Soviet Union.
For years the both alliances never engaged in military war but developed strategic policies aimed at the containment of each other in Europe while working and fighting for influence within the wider Cold War on the international stage. I hope this helps, thanks!
Answer:
Stretch is key I recommend watching a tutorial then get down the basics and try it while recording your self compare it to the video so you can see what you need to fix
Explanation:
Hope it helps
