The amphibians' common receptacle for the urinary, genital, and digestive canals is the :

Options

A. vulva
B. glottis
C. cloaca
D. tympanum

Explanation

To solve the question regarding the common receptacle for the urinary, genital, and digestive canals in amphibians, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the common receptacle in amphibians that serves the urinary, genital, and digestive systems.

2. **Identify the Options**: The options provided are:
- A) Vulva
- B) Glottis
- C) Cloaca
- D) Tympanum

3. **Evaluate Each Option**:
- **Option A: Vulva**: This is incorrect as the vulva refers to the external female genitalia and does not serve as a receptacle for all three systems.
- **Option B: Glottis**: This is also incorrect because the glottis is the opening to the vocal cords and does not function as a receptacle for urinary, genital, and digestive canals.
- **Option C: Cloaca**: This is the correct answer. The cloaca is a common chamber that receives the products from the urinary, genital, and digestive systems in amphibians.
- **Option D: Tympanum**: This option is incorrect as the tympanum refers to the eardrum, which is not related to the receptacle for the mentioned systems.

4. **Conclude the Answer**: After evaluating all options, the correct answer is **C) Cloaca**.

### Final Answer:
The common receptacle for the urinary, genital, and digestive canals in amphibians is the **Cloaca**.

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