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Yes, it is caused by gases. <b>[[User:Sgt.johnson|<font color="Black">A</font>]][[User talk:Sgt.johnson|<font color="Black">J</font>]][[Image:ArmyJROTC.jpg|20px]]</b> 01:37, 7 November 2007 (UTC) | Yes, it is caused by gases. <b>[[User:Sgt.johnson|<font color="Black">A</font>]][[User talk:Sgt.johnson|<font color="Black">J</font>]][[Image:ArmyJROTC.jpg|20px]]</b> 01:37, 7 November 2007 (UTC) | ||
:No, its not. Blood color is caused by the content of the blood. Blood is normally colorless when it is in the veins, but when it comes in contact with air, then it changes color. Human blood is red because human blood contains hemoglobin, which contains iron. Most known living things have red blood because they use hemoglobin, but a few creatures use hemocyanin, which is copper based and makes blood blue. So, while Grunts, Elites, and Jackals appear to have copper based blood, Prophets and humans, like most other mammals, have red blood. All this to say, the same color of blood doesnt mean we are genetically related. --<b>[[User:ED|<font color="black">E</font>]][[User talk:ED|<font color="black">D</font>]][[Image:ArmyROTC.gif|15px]]</b> 01:50, 7 November 2007 (UTC) |
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