In the context of taxonomy, the term "comprise" is commonly used in research articles, while "constitute" is not appropriate to describe the relationship betwee

In the context of taxonomy, the term "comprise" is commonly used in research articles, while "constitute" is not appropriate to describe the relationship between phyla and classes. To convey the intended meaning that phyla exclusively contain the classes mentioned, the phrase "phyla are comprised of classes" is unambiguous. This formulation signifies that the phyla encompass and solely consist of the mentioned classes. Referring to the relationship as "a phylum comprises classes" simply denotes that these classes are included within the phylum. By adhering to these distinctions, the paragraph conveys a more technical and professional tone.