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Blood is a fluid substance that circulates in the arteries and veins of the body. Blood is bright red or scarlet when it has been oxygenated in the lungs and passes into the arteries; it becomes bluish red when it has given up its oxygen to nourish the tissues of the body and is returning to the lungs through the veins and the tiny vessels called capillaries. In the lungs, the blood gives up the …

…important because nobody has the same DNA pattern. Every single person’s is different. DNA also lasts forever, it never disappears. Bibliography Bibliography http://www.letsfindout.com/subjects/body/rfipulma.html http://www.watchtower.org/medical_care_and_blood.htm http://www.letsfindout.com/subjects/body/veins.html http://www.encyclopedia.com/articles/01579.html http://www.letsfindout.com/subjects/body/rfiblood.html "Blood" - Encarta Encyclopedia "Blood Type" - Encarta Encyclopedia "Forensics"- Encarta Encyclopedia