Plants are called ................because they fix carbon dioxide.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Role of Plants**: Plants play a crucial role in the ecosystem by converting inorganic substances into organic matter. They are essential for the process of photosynthesis.

2. **Photosynthesis Process**: During photosynthesis, plants take in carbon dioxide (CO2) from the atmosphere and water (H2O) from the soil. They use sunlight as energy to drive this process.

3. **Chlorophyll's Role**: Chlorophyll, the green pigment found in plants, is vital as it captures sunlight. This energy is necessary for the conversion of CO2 and H2O into glucose (C6H12O6).

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