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Hairs occur in all mammals except those ...

Hairs occur in all mammals except those of

A

Rodentia

B

Chiroptera

C

Primata

D

Cetacea

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Question**: The question asks which group of mammals lacks hair. To answer this, we need to identify the characteristics of mammals and any exceptions to the general rule about hair. 2. **Characteristics of Mammals**: All mammals belong to the class Mammalia, which is characterized by the presence of mammary glands, hair, and typically giving birth to live young (with some exceptions like monotremes). 3. **Identifying Exceptions**: While most mammals have hair, we need to consider which specific group might not. The class Cetacea, which includes whales and dolphins, is known for its aquatic lifestyle. 4. **Reason for Lack of Hair**: In aquatic mammals like whales and dolphins, hair is not necessary for insulation or heat retention as they live in water. Instead, they have adaptations suitable for their environment. 5. **Conclusion**: The correct answer to the question is that hair occurs in all mammals except those of the class Cetacea (whales and dolphins). ### Final Answer: Hairs occur in all mammals except those of the class Cetacea (whales and dolphins). ---
### Step-by-Step Solution: 1. **Understanding the Question**: The question asks which group of mammals lacks hair. To answer this, we need to identify the characteristics of mammals and any exceptions to the general rule about hair. 2. **Characteristics of Mammals**: All mammals belong to the class Mammalia, which is characterized by the presence of mammary glands, hair, and typically giving birth to live young (with some exceptions like monotremes). 3. **Identifying Exceptions**: While most mammals have hair, we need to consider which specific group might not. The class Cetacea, which includes whales and dolphins, is known for its aquatic lifestyle. ...
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