How do scrotal sacs act as thermoregulators?

Explanation

**Step-by-Step Solution:**

1. **Definition of Thermoregulation**:
- Thermoregulation refers to the ability of an organism to maintain its internal body temperature within certain boundaries, even when the surrounding temperature is different.

2. **Location of Testes**:
- The testes are located in the scrotal sacs, which are situated outside the body. This external position is crucial for their function.

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