Question

which level of classification includes the most species?
○ kingdom
○ domain
○ genus
○ class

Explanation:

In biological classification, the hierarchy from broadest to most specific is domain, kingdom, phylum, class, order, family, genus, species. The broader the classification level, the more species it includes. Domain is the highest (broadest) level among the options, so it includes the most species. Kingdom is less broad than domain, class is more specific than kingdom, and genus is much more specific (closer to species level).

Answer:

B. domain