Earthworm does not have -

Options

A. A distinct head
B. Excretory organ
C. Alimentary canal
D. Reproductive organ

Answer

To answer the question "Earthworm does not have -", we will analyze the options provided and determine which one is correct based on the anatomical features of earthworms.

### Step-by-Step Solution:

1. **Identify the Phylum**:
- Earthworms belong to the phylum **Annelida**. This is important as it helps us understand the general characteristics of organisms in this group.

**Hint**: Remember the classification of earthworms; they are segmented worms.

2. **Examine the Options**:
- The options given are:
- A) Distinct head
- B) Excretory organ
- C) Elementary canal
- D) Reproductive organ

3. **Analyze Each Option**:
- **A) Distinct head**:
- Earthworms do not have a distinct head like many other organisms. Instead, they have a more cylindrical body with a slight anterior end but no clearly defined head structure.
- **B) Excretory organ**:
- Earthworms do have excretory organs known as **nephridia**, which help in the removal of waste.
- **C) Elementary canal**:
- Earthworms possess a complete digestive system, including an elementary canal that runs from the mouth to the anus.
- **D) Reproductive organ**:
- Earthworms have reproductive organs. They are hermaphrodites, meaning they have both male and female reproductive structures.

4. **Conclusion**:
- Based on the analysis, the correct answer is **A) Distinct head**. Earthworms do not have a distinct head.

### Final Answer:
Earthworm does not have a **distinct head**.