Croacking sound is louder in male frog than female. Give reason.

Explanation

### Step-by-Step Solution:

1. **Observation of Male and Female Frogs**: The first step is to observe the physical differences between male and female frogs. Notably, male frogs have a unique structure that females do not possess.

2. **Identification of Vocal Sac**: Male frogs have a balloon-like structure in their throat known as the vocal sac. This structure is absent in female frogs.

3. **Function of the Vocal Sac**: The vocal sac serves as a resonator. Its primary function is to amplify the sound produced by the male frog when it croaks.

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