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the bone-like substance beneath the enamel of the tooth.
a sensation of unease and discomfort in the upper stomach with an involuntary urge to vomit. A...
the acidic fluid secreted into the mammalian stomach which contains various digestive enzymes...
gas consisting mainly of methane and carbon dioxide, which is produced as a result of...
biological classification group (taxon) that is divided into species (the plural of genus is...