Human skull consists of all immovable joints.

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of the Human Skull:**
- The human skull is primarily composed of bones that are joined together by immovable joints, known as sutures. These joints are fixed and do not allow any movement.

2. **Identifying the Parts of the Skull:**
- The upper part of the skull, which includes the cranium, is made up of these immovable joints. This structure protects the brain and is designed to be sturdy and secure.

3. **Recognizing the Exception:**
- However, there is one significant exception to this rule: the lower jaw, also known as the mandible. The mandible is connected to the skull by a movable joint called the temporomandibular joint (TMJ).

4. **Function of the Movable Joint:**
- The lower jaw allows for movement, which is essential for functions such as chewing food and speaking. This movement distinguishes it from the rest of the skull, which is largely immobile.

5. **Conclusion:**
- Since the statement claims that the human skull consists of all immovable joints, it is incorrect. While the majority of the skull is made up of immovable joints, the presence of the movable lower jaw means that the statement is false.

**Final Answer:**
The statement "Human skull consists of all immovable joints" is false.

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