When two organisms belong to the same order, it means they must also belong to the same class.
• The relative level of a group of organisms in a taxonomic hierarchy is termed as the taxonomic rank in biological classification.
• The taxonomic ranks are species, genus, family, order, class, phylum, kingdom, and domain.
• When two organisms belong to the same order, it can be considered that they must belong to the same class, phylum, and kingdom.
• The orders are the smaller groups within different classes, and class is the third level of classification.
• For example, phylum Chordata comprises classes birds, mammals, and reptiles, and Carnivora is the order within Mammalia.
Thus, the correct answer is option C, that is, class.
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