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A(n) ___ is a step-like landform found above a stream and its floodplain. It is a remnant of an older flood plain or river-eroded flat surface.
Antigens
Substances that the immune system recognizes as foreign or dangerous, leading to an immune response.
Bacterium
Single-celled microorganisms that are often beneficial but can also cause infections.
Virus
A microscopic infectious agent that replicates only inside the living cells of an organism.
Lymphocytes
A type of white blood cell that is part of the immune system, playing a significant role in the body's defense mechanisms against pathogens.
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