Trunk of elephant is formed by

Options

A. upper lip and lower lip
B. upper lip and nose
C. upper lip
D. upper lip and abdomen.

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of the Trunk**: The trunk of an elephant is a unique and complex structure that serves multiple functions. It is important to identify what anatomical parts contribute to its formation.

2. **Identifying the Components**: The trunk is scientifically known as the proboscis. It is formed from the fusion of specific parts of the elephant's anatomy during fetal development.

3. **Fetal Development**: During the fetal stage, the upper lip and the nose are initially separate. As development progresses, these two parts fuse together.

4. **Final Composition of the Trunk**: After the fusion, the trunk is formed, which consists of the upper lip and the nose. This fusion allows for the trunk to have its elongated and flexible structure.

5. **Eliminating Incorrect Options**:
- Option A (upper lip and lower lip) is incorrect because the lower lip does not contribute to the trunk.
- Option C (upper lip only) is incorrect as the trunk is not formed by just one part.
- Option D (upper lip and abdomen) is also incorrect since the abdomen does not play a role in the formation of the trunk.

6. **Conclusion**: The correct answer is option B, which states that the trunk of the elephant is formed by the upper lip and the nose.

### Final Answer:
**The trunk of the elephant is formed by the upper lip and nose (Option B).**

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