Oxygen plays a key role in troposphere while ozone in the stratosphere. Elaborate.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Troposphere:**
- The troposphere is the lowest layer of Earth's atmosphere, extending from the surface up to about 8 to 15 kilometers high. It is where most of the Earth's weather occurs and contains approximately 75% of the atmosphere's mass.

2. **Role of Oxygen in the Troposphere:**
- Oxygen (O2) is crucial for life on Earth. It is necessary for the process of respiration, which is how living organisms, including humans, convert food into energy. During respiration, oxygen is inhaled and used to break down glucose, releasing carbon dioxide and water as byproducts.
- This process is vital for sustaining life, as it provides the energy needed for biological activities.
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