In order for this synthesis to occur, a series of steps are necessary and any disruption in this process can result in a deficiency of vitamin D. With this in mind, choose the situations or conditions that could contribute to a vitamin D deficiency. Check all that apply Living in a region with a lot of sunlight Having a lighter skin pigmentation Having kidney disease wearing protective clothing and sunscreen when outdoors

Having kidney disease wearing protective clothing and sunscreen when outdoors

Explanation:

In principle, vitamin D deficiency is caused by reduced skin exposure to the sun, because this vitamin is synthesized with an enzyme precursor by the sun action. People who have kidney failure may also have this deficiency because its absorption is difficult for these patients.The skin of people who use excess sunscreen form less vitamin D.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.