Gill slits of chordates are

Options

A. Paired
B. Lateral perforations
C. Pharyngeal
D. All the above

Answer

### Step-by-Step Text Solution:

1. **Understanding Chordates**: Chordates belong to the phylum Chordata, which is characterized by the presence of a notochord, a dorsal nerve cord, and pharyngeal slits at some stage of their development.

2. **Defining Gill Slits**: In chordates, gill slits are also known as pharyngeal slits. These are openings that occur in the pharynx, which is located just behind the mouth.

3. **Function of Gill Slits**: In aquatic chordates, these slits develop into gills, which are used for respiration. In some other chordates, they may serve different functions, such as feeding.

4. **Characteristics of Gill Slits**:
- They are **paired**, meaning there are two on each side of the pharynx.
- They are **lateral**, located on the sides of the body.
- They are **perforations**, as they create openings through which water can flow.
- They are also referred to as **pharyngeal slits**, highlighting their anatomical location.

5. **Conclusion**: Given the characteristics and functions of gill slits in chordates, all the provided options (paired, lateral, perforations, pharyngeal) are correct. Therefore, the correct answer is **"all of the above"**.

### Final Answer:
The gill slits of chordates are **paired, lateral, perforations, pharyngeal**, and the correct option is **D. all of the above**.

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