Chief producer in aquatic ecosystem is___________

Explanation

**Step-by-Step Solution:**

1. **Understanding the Role of Producers:**
- In any ecosystem, producers are organisms that can produce their own food through photosynthesis or chemosynthesis. They form the base of the food chain.

2. **Identifying Producers in Different Ecosystems:**
- In terrestrial ecosystems, the primary producers are green plants, trees, and other vegetation. They utilize sunlight to create energy through photosynthesis.

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