Is it true that if the dissolved oxygen level drops to zero, the water will become septic. Given an example which could lower the dissolved oxygen content of an aquatic body.

Explanation

**Step-by-Step Solution:**

1. **Understanding Dissolved Oxygen (DO):**
- Dissolved oxygen refers to the amount of oxygen that is present in water. It is crucial for the survival of aquatic organisms such as fish, invertebrates, and microorganisms.

2. **Impact of Zero Dissolved Oxygen:**
- If the dissolved oxygen level in water drops to zero, it means that there is no oxygen available for aquatic life. This condition leads to a state known as "septic," where the water becomes polluted and unable to support life.

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