Identify the group of animals that exhibit the following characters .
(i) Two parts of limbs , adapted for walking running , climbing burrowing , swimming or flying .
(iii) External ears of pinnae are present
(iv) They are viviparous with few exceptions .

Options

A. Reptilia
B. Aves
C. Amphibia
D. Mammalia

Answer

To identify the group of animals that exhibit the specified characteristics, we will analyze each characteristic step by step.

### Step 1: Analyze the First Characteristic
The first characteristic states that the animals have "two parts of limbs, adapted for walking, running, climbing, burrowing, swimming, or flying."
- Many animals have limbs that can be categorized into forelimbs and hindlimbs.
- These limbs are versatile and can adapt to various modes of locomotion.

**Hint:** Think about animals that have limbs capable of multiple functions.

### Step 2: Analyze the Second Characteristic
The second characteristic mentions "external ears of pinnae are present."
- Pinnae are the external parts of the ears that help in sound collection.
- This feature is commonly found in mammals.

**Hint:** Consider which groups of animals typically have external ears.

### Step 3: Analyze the Third Characteristic
The third characteristic states that "they are viviparous with few exceptions."
- Viviparous animals give birth to live young rather than laying eggs.
- While most mammals are viviparous, there are exceptions like the platypus, which is oviparous.

**Hint:** Recall which animal groups are known for giving live birth.

### Step 4: Eliminate Incorrect Options
Now, we will look at the given options: bacteria, apes, amphibians, and mammals.
- **Bacteria**: These are single-celled organisms and do not have limbs or ears.
- **Apes**: While they have limbs and are viviparous, they do not have external ears like pinnae.
- **Amphibians**: They have limbs but typically do not have external pinnae and are not exclusively viviparous.
- **Mammals**: They have limbs adapted for various functions, possess external ears, and are primarily viviparous.

**Hint:** Compare each option against the characteristics to find the best match.

### Step 5: Conclusion
Based on the analysis, the group of animals that exhibit all the specified characteristics is **Mammals** (Mammalia).

**Final Answer:** Mammals (Mammalia)