The broadest classification level in biology is known as the Domain. This level is the highest rank in the hierarchical biological classification system, which groups all living organisms into three main categories: Bacteria, Archaea, and Eukarya.
Bacteria and Archaea are both prokaryotic domains, meaning their cells lack a nucleus and other membrane-bound organelles. Eukarya, on the other hand, includes all eukaryotic organisms, which have cells with a nucleus and other organelles enclosed within membranes. This domain encompasses a wide range of life forms, including plants, animals, fungi, and protists.
The domain level is crucial for understanding the fundamental differences and evolutionary relationships among all living organisms. It provides a broad overview of life’s diversity and helps scientists categorize and study the vast array of species on Earth.