The primary means by which the immune system defends against invading organisms is to

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Antibodies are proteins produced by the immune system that can recognize and bind to specific foreign molecules, such as those found on the surface of invading viruses or bacteria. Once an antibody binds to a foreign cell, it can activate other immune cells to come and kill the invader or mark it for destruction. This is a primary means by which the immune system defends against invading organisms.

The Primary Means by Which the Immune System Defends Against