What does the Domain Bacteria consist of?

The Domain Bacteria consists of prokaryotic, unicellular organisms that lack a nucleus and other membrane-bound organelles. These microorganisms are characterized by their simple cell structure and typically reproduce asexually through binary fission. They can be found in diverse environments and play critical roles in various ecological processes, including nutrient cycling and symbiosis.

This classification distinguishes them from other forms of life, such as fungi, which are multicellular and belong to a different domain (Eukarya), and eukaryotic microorganisms that include organisms with complex cells. Additionally, plant-like organisms, which are classified within the domain Eukarya, are not part of the bacteria domain, as they have chloroplasts and perform photosynthesis. Thus, the defining feature of the Domain Bacteria being prokaryotic and unicellular is what makes this answer accurate.