How much carbon is fixed by photosynthesis in a year by producers ?

Explanation

To answer the question of how much carbon is fixed by photosynthesis in a year by producers, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Producers**:
- Producers are organisms that can make their own food through photosynthesis. The primary examples are plants, algae, and some bacteria.

2. **Understand Photosynthesis**:
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