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The incursions of the Scandinavian Vikings into other parts of Europe
Blood Vessels
Tubular structures carrying blood through the tissues and organs; a vital component of the circulatory system, including arteries, veins, and capillaries.
Lungs
Pair of respiratory organs located in the chest, responsible for gas exchange between the air and the blood.
Acquired Immunodeficiency Syndrome
A chronic, potentially life-threatening condition caused by HIV, leading to severe damage to the immune system.
Immune System
The complex network of cells, tissues, and organs that work together to defend the body against attacks by foreign invaders, such as viruses, bacteria, and other pathogens.
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