In vertebrates, lacteals are found in

Options

A. intestine
B. ischium
C. oesophagus
D. ear

Explanation

**Step-by-Step Solution:**

1. **Understanding Lacteals**: Lacteals are specialized lymphatic vessels that are involved in the absorption of dietary fats and fat-soluble vitamins (A, D, E, and K) from the digestive system.

2. **Location of Lacteals**: In vertebrates, lacteals are primarily found in the small intestine. The small intestine has numerous finger-like projections called villi that increase the surface area for absorption.

3. **Structure of Villi**: Each villus contains a lacteal, which is a lymphatic vessel. The presence of lacteals in the villi allows for the efficient absorption of fats and fat-soluble vitamins, which cannot be directly absorbed into the bloodstream.

4. **Elimination of Incorrect Options**:
- The ischium is part of the pelvic girdle and does not contain lacteals.
- The esophagus is part of the digestive tract but does not have lacteals.
- The ear is unrelated to the digestive system and does not contain lacteals.

5. **Conclusion**: Therefore, the correct answer to the question is that lacteals are found in the **small intestine**.

**Final Answer**: In vertebrates, lacteals are found in the **small intestine**.

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