Which is not human character ?

Options

A. Prominent brow ridges
B. Crescentric dental arch
C. Upright incisors
D. Both A and B.

Explanation

To determine which characteristics are not human, we can analyze the options provided: prominent brow ridges, crescentic dental arch, and upright incisors.

### Step-by-Step Solution:

1. **Identify Human Characteristics**:
- Humans typically have certain physical traits that distinguish them from other primates. These include:
- Reduced brow ridges
- Parabolic (not crescentic) dental arch
- Upright posture and bipedal locomotion
- Absence of a tail (except for the vestigial coccyx)

2. **Analyze Each Option**:
- **Prominent Brow Ridges**:
- This feature is more pronounced in non-human primates, such as apes. Humans have a flatter forehead and less pronounced brow ridges.
- **Crescentic Dental Arch**:
- Humans have a parabolic dental arch, while a crescentic dental arch is characteristic of some non-human primates.
- **Upright Incisors**:
- Humans have upright incisors, which are a characteristic of our species. This feature is not a distinguishing factor against being human.

3. **Conclusion**:
- Based on the analysis, both "prominent brow ridges" and "crescentic dental arch" are not human characteristics. Therefore, the correct answer is that both A (prominent brow ridges) and B (crescentic dental arch) are not human characters.

### Final Answer:
Both A (Prominent Brow Ridges) and B (Crescentic Dental Arch) are not human characters.

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