Write the most important characteristic feature of each of the following groups of organisms.
Monera

Explanation

### Step-by-Step Text Solution:

1. **Definition of Monera**: Monera is a kingdom that includes all prokaryotic organisms, which are primarily unicellular.

2. **Cell Structure**: The most important characteristic feature of Monera is that they are prokaryotes. This means they lack a well-defined nucleus and membrane-bound organelles.

3. **Cell Wall**: Organisms in the Monera kingdom have a rigid cell wall, which provides structure and protection.

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