Why does the Tasmanian devil immune system not fight off the foreign cells that cause Devil Facial Tumor Disease (DFTD)? O The invading cells do not have Major Histocompatibility Complex proteins. O The invading cells are not bad for the body so the immune system does not destroy them. The invading cells are so similar to the devil's own cells that the body doesn't recognize them as non-self. O The Tasmanian devil immune system is very weak and doenot fight off invading non-self cells of any type.

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