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Why do tumors create problems for organisms ?

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Tumors are bunches of abnormal tissue growth, and they can constrict airways, and block your veins and arteries, causing them to be potentially fatal. 
User Michasaucer
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Tumors are bunches of abnormal tissue growth, and they can constrict airways, and block your veins and arteries, causing them to be potentially fatal.
User Chanel
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