Canines are reduced or absent in

Options

A. Lagomorpha
B. Rodentia
C. Perissodactyla
D. All the above.

Answer

To solve the question "Canines are reduced or absent in," we will analyze each of the given options step by step.

### Step 1: Understand the Types of Teeth
Mammals typically have four types of teeth: incisors, canines, premolars, and molars. Canines are sharp teeth used primarily for tearing food.

### Step 2: Analyze the Options
1. **Lagomorpha**: This order includes animals like rabbits and hares. In these animals, the canines are either absent or significantly reduced. They have large incisors that are adapted for their herbivorous diet.

2. **Rodentia**: This order consists of rodents such as rats, mice, and squirrels. In rodents, the canines are also either absent or reduced. They possess ever-growing incisors that are crucial for gnawing, and there is a gap between their incisors and molars, indicating the absence of canines.

3. **Perissodactyla**: This order includes odd-toed ungulates like horses and rhinoceroses. In these mammals, canines are typically absent or reduced as well, as their diet is primarily herbivorous.

### Step 3: Conclusion
Since all three groups (Lagomorpha, Rodentia, and Perissodactyla) exhibit reduced or absent canines, the correct answer to the question is:

**Option 4: All the above.**

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