Smallest division of in the modern system classification?

The smallest division in the modern system of classification is the species.

Here's why:

* Hierarchical System: The modern classification system is hierarchical, meaning it organizes life into increasingly specific groups.

* Levels: These groups, or levels, are:

* Domain

* Kingdom

* Phylum

* Class

* Order

* Family

* Genus

* Species

* Species Definition: A species is defined as a group of organisms that can interbreed and produce fertile offspring.

While there are sometimes sub-species classifications, the species level is the most fundamental and universally recognized unit in modern taxonomy.