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True horns are always...

True horns are always

A

hollow

B

arise from frontal bones

C

never shed

D

all correct

Text Solution

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The correct Answer is:
To answer the question "True horns are always," we need to analyze the characteristics of true horns based on the provided information. ### Step-by-Step Solution: 1. **Understanding True Horns**: - True horns are permanent pointed projections found on the heads of certain mammals, particularly ruminant artiodactyls like cattle, goats, and antelopes. 2. **Characteristics of True Horns**: - **Hollow Structure**: True horns have a hollow space between the keratin sheath and the core of live bone. This means that they are indeed hollow. - **Origin**: True horns arise from the frontal bones of the skull. This is a critical point as it indicates their anatomical structure. - **Permanence**: True horns are permanent structures; they are present from birth and do not shed throughout the animal's life. This distinguishes them from antlers, which do shed. 3. **Evaluating the Options**: - **Option A (Hollow)**: True horns are hollow due to the space between the keratin sheath and the bone. - **Option B (Arise from Frontal Bones)**: True horns do arise from the frontal bones of the skull. - **Option C (Never Shed)**: True horns are permanent and do not shed. - **Option D (All Correct)**: Since all the previous statements are true, this option is also correct. 4. **Conclusion**: - Since all the characteristics mentioned (hollow, arise from frontal bones, and never shed) are true for true horns, the correct answer is **Option D: All correct**. ### Final Answer: **Option D: All correct** ---
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