Question

what is the smallest taxonomic group that contains organisms of different species?
○ genus
○ order
○ family
○ domain

Explanation:

To solve this, we recall taxonomic hierarchy (domain, kingdom, phylum, class, order, family, genus, species). A genus can include multiple species (different species within the same genus). Order, family, and domain are larger groups than genus and contain more diverse organisms. So the smallest group with different species is genus.

Answer:

A. genus