both middle and internal ears occur in

Options

A. cacilians
B. necturns
C. salamander
D. frog and toads.

Answer

To solve the question "Both middle and internal ears occur in," we need to analyze the options provided and determine which of them possess both types of ears.

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking which organism has both middle and internal ears. It specifically mentions these two types of ears, excluding the external ear.

2. **Examine the Options**:
- **Option A: Cachillions**:
- In Cachillions, only the middle ear is present, but the internal ear is absent. Therefore, this option does not satisfy the requirement.
- **Option B: Nectons**:
- Nectons have an internal ear but lack a middle ear. Thus, this option also does not meet the criteria.
- **Option C: Salamander**:
- Salamanders typically do not have either a middle or internal ear. In some cases, infant salamanders may have an internal ear, but generally, both are absent in young salamanders. This option is incorrect.
- **Option D: Frog and Toads**:
- Frogs and toads possess both middle and internal ears, which aid in their hearing. They do not have an external ear, which aligns with the question's focus.

3. **Conclusion**: Based on the analysis of each option, the correct answer is **Option D: Frog and Toads**.

### Final Answer:
Both middle and internal ears occur in **Frog and Toads**.

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