Which of the following is the most specific level of taxonomy?

The most specific level of taxonomy is species. In the hierarchical system used to classify organisms, levels progress from broader categories to more specific ones. The species level represents a group of organisms that can interbreed and produce fertile offspring, making it the most precise classification.

In comparison, other taxonomic ranks such as genus, family, and class encompass a wider range of organisms. For instance, the genus groups together species that are closely related, but it can include multiple species. The family encompasses multiple genera, making it even broader. Class further increases the grouping to include various families. Each step up in this hierarchy aggregates more organisms and therefore loses specificity, reinforcing that species is the most precise level of classification in taxonomy.