Name the most vital process where water takes part in the reaction in which one of the products is a supporter of life.

Explanation

**Step-by-Step Solution:**

1. **Identify the Process Involving Water**: The question asks for a vital process where water is a reactant. We need to think about processes in nature where water is used in a chemical reaction.

2. **Consider the Role of Water**: Water (H2O) is essential in many biological and chemical processes. However, we are looking for a specific process that produces a supporter of life.

3. **Define a Supporter of Life**: A supporter of life typically refers to something that is essential for living organisms. The most common supporter of life is oxygen (O2), which is crucial for respiration in most living beings.

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