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As a T cell activates, the process by which it double checks to ensure the substance is "non-self" is called
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- What is the purpose of an aqueduct?1. It harvests crops as twice the pace of a human hand.2. It acts as a deterrent to invaders by launching painful weaponry over castle walls. 3. It carries water from place to place. 4. It prevents incoming ships from docking at a foreign port.