Which of the following is the character of dorsal blood vessel of earthworm?

Options

A. Collecting in the other body segments
B. collecting in first 13 segments
C. Distributing in the first 13 segments
D. both A and C

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the characteristics of the dorsal blood vessel in earthworms. We need to identify which of the provided options correctly describe this structure.

2. **Identifying the Dorsal Blood Vessel**: The dorsal blood vessel in earthworms is a major component of their circulatory system. It is located along the back (dorsal side) of the earthworm.

3. **Function of the Dorsal Blood Vessel**: The primary function of the dorsal blood vessel is to collect blood from various segments of the earthworm's body and distribute it to the first 13 segments. This indicates that it plays a crucial role in the circulation of blood within the earthworm.

4. **Analyzing the Options**:
- We need to evaluate each option provided in the question to determine which ones accurately describe the dorsal blood vessel's characteristics.
- Based on the information, we know that the dorsal blood vessel collects blood from other body segments and distributes it to the first 13 segments.

5. **Selecting the Correct Options**:
- If option 1 states that the dorsal blood vessel collects blood from other segments, it is correct.
- If option 3 states that it distributes blood to the first 13 segments, it is also correct.
- If option 2 suggests that it collects from the 13th segment, it is incorrect.
- If option 4 states that both options A and C are correct, then this is the right choice.

6. **Conclusion**: The correct answer to the question is option 4, which states that both A and C are correct.