Some forms of life do not depend upon oxygen. Explain.

Explanation

### Step-by-Step Solution:

1. **Understanding Respiration**: Most living organisms, including humans, rely on oxygen for respiration. During this process, they consume oxygen and release carbon dioxide.

2. **Identifying Anaerobic Organisms**: However, there are certain forms of life, particularly some bacteria, that do not require oxygen for their survival. These organisms are known as anaerobes.

3. **Effects of Oxygen on Anaerobes**: In fact, for some anaerobic bacteria, oxygen can be toxic. These bacteria thrive in environments devoid of oxygen.

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