Which one is bright red coloured ?

Options

A. Nereis
B. Aphrodite
C. Bonellia
D. Tubifex

Answer

To solve the question "Which one is bright red coloured?" we will analyze the options provided: Nereus, Aphrodite, Bonellia, and Tubifex.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are Nereus, Aphrodite, Bonellia, and Tubifex. We need to determine which of these is bright red in color.

2. **Analyze Each Option**:
- **Nereus**: This is a genus of polychaete worms that are primarily marine species. They typically exhibit colors like brown or green. Therefore, Nereus is not bright red.
- **Aphrodite**: Commonly known as the sea mouse, Aphrodite can change colors from brown to golden. This does not include bright red, so it is also not the correct answer.
- **Bonellia**: This genus of marine worms contains a pigment called Bonilin, which gives them a green color. Thus, Bonellia is not bright red either.
- **Tubifex**: Known as tube earthworms, Tubifex are easily recognized by their bright red color. They are often found in environments that may lack sufficient oxygen, which allows them to display their bright coloration without the risk of predation.

3. **Conclusion**: After analyzing all the options, the only organism that is bright red in color is **Tubifex**.

### Final Answer:
The correct answer is **Tubifex**.

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