Why is Calvin cycle also known as `C_(3)` cycle?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Calvin Cycle**: The Calvin cycle is a crucial part of photosynthesis, specifically the dark reactions. It is responsible for converting carbon dioxide (CO2) into organic compounds, primarily glucose.

2. **Phases of Photosynthesis**: Photosynthesis occurs in two main phases: the light reactions and the dark reactions (Calvin cycle). The light reactions capture light energy and convert it into chemical energy, which is then used in the Calvin cycle.

3. **Stages of the Calvin Cycle**: The Calvin cycle consists of three main stages:
- **Carbon Fixation (Carboxylation)**: In this stage, CO2 from the atmosphere is fixed into a stable compound.
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