Arsenic is an element which is classified as a metalloid. It can be found as one of the components of the Earth's crust, or in other words, it can be found in nature. Arsenic is also considered a toxic substance. In the given scenario above, if arsenic is being used to substitute phosphorus if phosphorus is not present, the result is that, the microbe would have a different nucleotide. The answer for this is option B.
