The smallest living organism with cell wall is

Options

A. yeast
B. algae
C. cyanobacteria
D. bacteria

Explanation

To determine the smallest living organism with a cell wall, we can follow these steps:

### Step 1: Understand the Options
We have four options to consider:
- A) Algae
- B) Cyanobacteria
- C) Bacteria
- D) Another type of Bacteria

### Step 2: Define Cell Wall Characteristics
The cell wall is a crucial feature of many organisms, providing structure and protection. We need to identify which of the options has the smallest cell wall.

### Step 3: Analyze Each Option
- **Algae**: Generally, algae have a more complex structure and larger cell walls compared to bacteria.
- **Cyanobacteria**: These are a type of bacteria that can perform photosynthesis and have a cell wall, but they are still classified under bacteria.
- **Bacteria**: Bacteria are prokaryotic organisms, and many have relatively simple and small cell walls compared to eukaryotic organisms like algae.
- **Another type of Bacteria**: This option is vague and does not specify any particular organism.

### Step 4: Identify the Smallest Living Organism with a Cell Wall
Among the options, bacteria are known to have the smallest cell walls. Specifically, some bacteria are unicellular and possess a simple cell wall structure.

### Conclusion
The smallest living organism with a cell wall is **Bacteria**.

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