What is the significance of dissolved oxygen to the aquatic organisms? How it gets depleted?

Explanation

### Step-by-Step Solution

**Step 1: Understanding the significance of dissolved oxygen**
- Dissolved oxygen is crucial for the survival of aquatic organisms, including both plants and animals.
- Aquatic plants and animals consume dissolved oxygen through a process called respiration.
- Additionally, dissolved oxygen plays a vital role in the decomposition of organic matter. When aquatic organisms die, bacteria and fungi break down their bodies, which requires oxygen.

**Step 2: Identifying how dissolved oxygen gets depleted**
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