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Milk glands are characteristic of...

Milk glands are characteristic of

A

All vertebrates

B

All mammals

C

Only placental mammals

D

Only primates and ruminants

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question:** The question asks about the characteristic feature of milk glands. We need to identify which group of animals possesses this feature. 2. **Identifying the Subphylum:** Milk glands are a specific feature that is found in a particular subphylum of the animal kingdom. The subphylum we are focusing on is Vertebrata. 3. **Classifying Vertebrates:** Within the subphylum Vertebrata, there are various classes. One of these classes is Mammalia. 4. **Characteristic Feature of Mammals:** The defining characteristic of the class Mammalia is the presence of mammary glands. These glands are responsible for producing milk. 5. **Function of Mammary Glands:** Mammary glands secrete milk, which is a nutrient-rich substance that provides nourishment to infants and newborns. 6. **Evaluating Options:** - Option 1 states that milk glands are present in all vertebrates. This is incorrect, as not all vertebrates have milk glands. - Option 2 states that milk glands are characteristic of all mammals. This is correct. - Option 3 mentions only placental mammals, which is also incorrect because milk glands are present in all types of mammals, including monotremes and marsupials. - Option 4 refers to only primates, which is incorrect as well. 7. **Conclusion:** The correct answer to the question is that milk glands are characteristic of all mammals. **Final Answer:** Milk glands are characteristic of all mammals. ---
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