Give some uses of oxygen.

Explanation

**Step-by-Step Solution:**

1. **Combustion**: Oxygen is essential for combustion. It acts as a supporter of combustion, meaning that substances burn in the presence of oxygen, producing heat.

2. **Breathing/Respiration**: Oxygen is vital for living organisms as it is used in the process of breathing or respiration. This process allows organisms to convert food into energy.

3. **Metal Extraction**: Oxygen is used in the extraction of metals from their ores. It helps in the chemical reactions that separate metals from their compounds.

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