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the actions of the body's immune system that work to fight infections or disease.
molecule that forms when carbon dioxide attaches itself to the amino group of a haemoglobin...
biological classification group (taxon) for plants that are divided into classes.
a thin hairlike outgrowth of an epidermal cell of a plant root that increases the surface area...
a genus of the Protozoa consisting of shapeless unicellular organisms that move by means...