Name the compound that contains Mg and helps green plants during photosynthesis.

Explanation

To answer the question, "Name the compound that contains Mg and helps green plants during photosynthesis," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Photosynthesis**:
- Photosynthesis is the process by which green plants convert light energy into chemical energy. This occurs in the presence of sunlight and a green pigment called chlorophyll.

2. **Identifying the Role of Magnesium**:
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