What is food chain ? Draw a food chain.

Explanation

### Step-by-Step Solution:

1. **Definition of Food Chain**:
A food chain is a linear sequence of organisms where each organism is eaten by the next one in the chain. It illustrates how energy and nutrients are transferred from one organism to another in an ecosystem.

2. **Understanding Trophic Levels**:
In a food chain, organisms are categorized into different trophic levels based on their role in the ecosystem:
- **Producers**: These are usually plants that convert sunlight into energy through photosynthesis.
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