Cells of many protistans, plants, and fungi, but not animals, commonly have :

Options

A. cell wall
B. ribosomes
C. plasma membrane
D. mitochondria

Explanation

To answer the question, "Cells of many protistans, plants, and fungi, but not animals, commonly have:", we need to analyze the options provided.

### Step-by-Step Solution:

1. **Identify the Key Components**: The question specifies that we are looking for a feature common to protists, plants, and fungi, but not found in animal cells.

2. **Consider the Options**: Although the options are not provided in the question, we can infer that common features might include structures like cell walls, ribosomes, plasma membranes, or mitochondria.

3. **Analyze Each Option**:
- **Cell Wall**: This is a rigid structure that surrounds the cell membrane in plants, fungi, and many protists. It provides structural support and protection. Animal cells do not have a cell wall; they only have a plasma membrane.
- **Ribosomes**: These are present in all cell types (including animal cells) and are involved in protein synthesis. Therefore, this option does not fit the criteria.
- **Plasma Membrane**: This is also present in all cells, including animal cells, so it cannot be the correct answer.
- **Mitochondria**: These are organelles found in most eukaryotic cells, including animal cells, so this option is also incorrect.

4. **Conclusion**: The only structure that fits the criteria of being present in protists, plants, and fungi, but not in animals, is the **cell wall**.

5. **Final Answer**: The correct answer is **cell wall**.