The organisms which do not have circulatory system?

Options

A. Paramecium
B. Man
C. Amoeba
D. Both (1) and (3)

Answer

To answer the question about organisms that do not have a circulatory system, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for organisms that lack a circulatory system.

2. **Identify the Options**: The options provided are:
- A) Paramecium
- B) Man
- C) Amoeba
- D) Both 1 and 3 (Paramecium and Amoeba)

3. **Analyze Each Option**:
- **Option A: Paramecium**: This is a single-celled organism. Single-celled organisms do not have a circulatory system because they rely on diffusion for the transport of nutrients and waste.
- **Option B: Man**: Humans are multicellular organisms and possess a complex circulatory system. Therefore, this option can be eliminated.
- **Option C: Amoeba**: Similar to Paramecium, Amoeba is also a single-celled organism and does not have a circulatory system.
- **Option D: Both 1 and 3**: Since both Paramecium and Amoeba do not have a circulatory system, this option is also valid.

4. **Conclusion**: The organisms that do not have a circulatory system are Paramecium and Amoeba. Therefore, the correct answer is option D (Both 1 and 3).

### Final Answer:
The organisms which do not have a circulatory system are Paramecium and Amoeba (Option D).

---