Although there are no known forms of life that rely entirely on…

Although there are no known forms of life that rely entirely on silicon-based chemistry, there are some that rely on silicon minerals for specific functions. Some bacteria and other forms of life, such as the protozoa radiolaria and diatom algae, have silicon dioxide skeletons, and the sea urchin has spines made of silicon dioxide. These forms of silicon dioxide are known as biogenic silica.
Arsenic (As) is another element that may substitute for a common element found in biological molecules. What element is this?
Arsenic was recently found to be able to substitute for this element in microorganisms living in Mono Lake, in California, where there are high levels of arsenic. What would happen to you if you were exposed to high levels of arsenic?

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