Examlex
Coral reefs have low productivity because their nutrient levels are typically low.
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.
Fungi
A kingdom of spore-producing organisms feeding on organic matter, including molds, yeast, mushrooms, and toadstools.
Antigens
Substances that the immune system recognizes as foreign, triggering an immune response.
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