Which term is used for pollutants that are degraded by natural means ?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Pollutants**: Begin by recognizing that pollutants are substances that cause pollution in the environment. They can come from various sources and can have harmful effects on living organisms and ecosystems.

2. **Identifying Natural Degradation**: Some pollutants can be broken down or degraded through natural processes. This degradation often involves the action of living organisms, particularly microorganisms.

3. **Role of Microorganisms**: Microorganisms such as bacteria and fungi play a crucial role in the degradation of certain pollutants. They produce enzymes that help convert complex substances into simpler, harmless forms.

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