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biological, chemical, or physical agent that stimulates a characteristic function or causes a particular response, especially an inflammatory response.
the practice and science of classification. This is the part of systematics that is only...
a sensation of unease and discomfort in the upper stomach with an involuntary urge to vomit. A...
a biological classification group (taxon) that is divided into families.
the process whereby the products of digestion are transported from the digestive tract into the...
endocrine gland situated on top of each kidney, which produces hormones in response to stresses...