How are autotrophs classified?

Explanation

### Step-by-Step Solution:

1. **Definition of Autotrophs**:
- Autotrophs are organisms that can produce their own food using simple substances. They do not rely on other organisms for nutrition.

2. **Types of Autotrophs**:
- Autotrophs are primarily classified into two main categories:
- **Photo-autotrophs**: These organisms utilize sunlight as their energy source to synthesize food.
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