Which of the following properties in the options given below will be shown by all of the following organisms?
Trypanosoma, Noctiluca, Monocystis, and Giardia

Options

A. These are all parasites
B. They have flagella
C. They produce spores
D. These are all unicellular protists.

Answer

To solve the question, we need to analyze the characteristics of the given organisms: Trypanosoma, Noctiluca, Monocystis, and Giardia. We will determine which property is shared by all of them.

### Step-by-Step Solution:

1. **Identify the Organisms**:
- **Trypanosoma**: This is a flagellate unicellular parasite known to cause diseases like sleeping sickness (trypanosomiasis).
- **Noctiluca**: This is a marine organism, also unicellular, known for its bioluminescence. It is not a parasite.
- **Monocystis**: This is an endoparasitic unicellular organism that lives inside the host and does not have flagella.
- **Giardia**: This is a unicellular protist that is also a parasite, causing giardiasis.

2. **Analyze the Characteristics**:
- **Flagella**: Not all organisms have flagella. Monocystis does not have flagella.
- **Parasites**: Not all are parasites. Noctiluca is not a parasite.
- **Spores**: Not all produce spores. Monocystis does not produce spores.
- **Unicellular**: All four organisms are unicellular.

3. **Conclusion**:
- The only characteristic that is common to all four organisms is that they are all unicellular. Therefore, the correct answer is that they all are unicellular protists.

### Final Answer:
All of the organisms (Trypanosoma, Noctiluca, Monocystis, and Giardia) are unicellular protists.