Gill slits function in :

Options

A. respiration
B. circulation
C. food trapping
D. both (a) and ( c)

Answer

### Step-by-Step Solution:

1. **Understanding Gill Slits**: Gill slits are openings found in the pharyngeal region of certain animals, particularly in fish and some amphibians. They play a crucial role in the respiratory system.

2. **Function in Aquatic Animals**: In aquatic animals, gill slits are primarily used for respiration. They allow water to flow over the gills, where oxygen is extracted from the water and carbon dioxide is expelled. This process is essential for the survival of these organisms in water.

3. **Function in Terrestrial Animals**: In land-living organisms, gill slits are present during the embryonic stage. In this stage, they are referred to as pharyngeal gills. While they do not function for respiration in adult land animals, they can assist in trapping food particles from the water during the embryonic phase.

4. **Analyzing the Options**:
- **Option A (Respiration)**: This is correct for aquatic animals.
- **Option B (Circulation)**: This is not a primary function of gill slits.
- **Option C (Food trapping)**: This is correct for the embryonic stage in terrestrial animals.
- **Option D (Both A and C)**: Since both respiration and food trapping are functions of gill slits, this option is also correct.

5. **Conclusion**: The correct answer to the question regarding the function of gill slits is **both A and C**.