A mature female frog can lay

Options

A. 2500 to 3000 ova
B. 25 to 30 ova
C. 250 to 300 ova
D. 125 to 130 ova

Explanation

### Step-by-Step Solution:

1. **Understanding the Female Reproductive System of Frogs**:
- The female frog has a pair of ovaries located near the kidneys. Each ovary produces eggs (ova).

2. **Oviducts and Cloaca**:
- From each ovary, there is a single oviduct that carries the ova. Both oviducts open into a structure called the cloaca, which serves as an exit point for both eggs and waste.

3. **Ova Production**:
- A mature female frog is capable of producing a large number of ova. The typical range for a mature female frog is between 2500 to 3000 ova at a time.

4. **Fertilization Process**:
- The ova are released into the water where external fertilization occurs, meaning that the sperm from the male fertilizes the eggs outside of the female's body.

5. **Conclusion**:
- Based on the information about the reproductive system and the number of ova produced, the answer to the question is that a mature female frog can lay **2500 to 3000 ova** at a time.

### Final Answer:
A mature female frog can lay **2500 to 3000 ova** at a time.

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