Which kingdom includes all prokaryotic organisms?

The kingdom that includes all prokaryotic organisms is Monera. Prokaryotes are characterized by the absence of a membrane-bound nucleus and other membrane-bound organelles. The two major groups within prokaryotes are bacteria and archaea, and both of these groups are classified under the Kingdom Monera.

In this kingdom, organisms are typically unicellular and exhibit a wide variety of shapes and metabolism types, allowing them to thrive in diverse environments. Monera encompasses the simplest forms of life, which are crucial for various ecological processes, including nutrient cycling and decomposition.

Understanding that the other kingdoms mentioned encompass eukaryotic organisms, such as animals, plants, and fungi, further clarifies why Monera is the correct answer. Each of those other kingdoms involves complex multicellular organisms that contain defined nuclei and organelles, fundamentally distinguishing them from the prokaryotic organisms found in Monera.