Which is a character of human?

Options

A. Longer forelimbs than hind limbs
B. 'U' shaped jaw
C. Parallel thumb to palm
D. Opposable thumb

Answer

To determine which character is specific to humans, we can analyze the given options step by step:

### Step 1: Analyze the First Option
- **Option 1:** Longer forelimbs than hind limbs.
- In humans, the hind limbs (legs) are longer than the forelimbs (arms). Therefore, this characteristic does not apply to humans.

### Step 2: Analyze the Second Option
- **Option 2:** U-shaped jaw.
- A U-shaped jaw is a characteristic feature of apes, not humans. Humans have a more parabolic jaw shape. Thus, this option is also incorrect.

### Step 3: Analyze the Third Option
- **Option 3:** Parallel thumb to the palm.
- Humans possess an opposable thumb, which allows for a wide range of motion and the ability to grasp objects. A parallel thumb is not a characteristic of humans. Therefore, this option is incorrect as well.

### Step 4: Analyze the Fourth Option
- **Option 4:** Opposable thumb.
- Humans have an opposable thumb, which means the thumb can move to touch the other fingers, allowing for better grip and manipulation of objects. This is a defining characteristic of humans and some other primates.

### Conclusion
- The correct answer is **Option 4: Opposable thumb**, as it is a distinct characteristic of humans.

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