Find out how Melvin Calvin worked out the complete biosynthetic pathway for synthesis of sugar.

Explanation

### Step-by-Step Solution:

1. **Understanding the Context**: Melvin Calvin was a prominent scientist who worked on the biosynthetic pathway for sugar synthesis in plants. His work primarily focused on the process of photosynthesis, which involves both light-dependent and light-independent reactions.

2. **Experimental Setup**: Calvin and his team conducted their experiments at the University of California. They used a radioactive isotope of carbon, specifically Carbon-14 (C-14), to trace the pathway of carbon during photosynthesis.

3. **Labeling Carbon Dioxide**: They supplied plants with carbon dioxide that was labeled with C-14. This allowed them to track how carbon from carbon dioxide was incorporated into organic molecules during the process of photosynthesis.

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