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an antigen preparation that stimulates the immune system to give protection against a particular disease or a group of diseases.
biological classification group (taxon) for animals that is divided into classes. The plural of...
hollow tubular vascular tissue cells, strengthened with lignin that conducts water and mineral...
anaerobic respiration that occurs in plants and results in the formation of ethanol and carbon...
tissue that makes up the majority of the plant body and performs various functions.
the acidic fluid secreted into the mammalian stomach which contains various digestive enzymes...