Prosimians differ from simians in

Options

A. Having nails instead of claws
B. Having claws in some of the digits
C. Having shorter hind limbs
D. Presence of tail .

Answer

To answer the question "Prosimians differ from simians in," we need to analyze the characteristics of both groups of primates.

### Step-by-Step Solution:

1. **Understanding the Groups**:
- Prosimians are considered the more primitive primates, which include lemurs, lorises, and tarsiers.
- Simians, on the other hand, include monkeys, apes, and humans.

2. **Physical Characteristics**:
- Prosimians may have claws on some of their digits, while they also possess nails on others.
- Simians predominantly have nails on all digits.

3. **Limb Proportions**:
- In prosimians, the hind limbs are generally longer than the forelimbs.
- In simians, the forelimbs are usually longer than the hind limbs.

4. **Tail Presence**:
- Both prosimians and simians can have tails, but the presence or absence of a tail does not distinctly differentiate the two groups.

5. **Analyzing the Options**:
- **Option A**: Having nails instead of claws - This is incorrect for prosimians, as they can have both.
- **Option B**: Having claws in some of the digits - This is correct, as prosimians do have claws on some digits.
- **Option C**: Having shorter hind limbs - This is incorrect; prosimians have longer hind limbs.
- **Option D**: Presence of tail - This does not distinctly differentiate the two groups.

6. **Conclusion**: The correct answer is **Option B: having claws in some of the digits**.