I'm still confused, becasue in the next paragraph, your edited sentence is as follows.<br /><br />"In the experiment, metal iron will be spiked on one of three types of biosolid&mdash;<strong>one</strong> with high levels of spiked contaminants and iron,<strong> the other</strong> with no spiked contaminants and iron, and <strong>another</strong> with high levels of biosolids and iron."<br /><br />So based on what you said, the above&nbsp;sentence you edited&nbsp;is incorrect?<br /><br />