What is a key characteristic of the 1st and 2nd levels of taxonomy?

The key characteristic of the first and second levels of taxonomy is that they are typically too broad for effective use in taxonomic terms. These levels usually represent generalized categories that encompass a wide range of concepts, making them less effective for precise indexing or retrieval of specific information. This broadness is intentional, as these levels are designed to provide a foundational understanding of the subject matter before delving into more detailed and specific categories in the subsequent levels of taxonomy. By understanding this, one can grasp why these levels serve more as introductory frameworks rather than exact classifications that could be applied in nuanced contexts.