C. High-visibility clothing is important to wear in areas with moving vehicles.
The answer is Ultraviolet Light
The easiest way for us to obtain a sustainable amount of Vitamin D is by exposing our self to morning sunlight ( which contain ultraviolet light)
Often time, we don't consume enough vitamin D and our body need to get it from our bones, and in order to do that, it need to be activated through enough exposure from sunlght
1 what are the three structures of the cardiovascular system
To keep out dirt and other bad things
