One of the most resistant biological materials known is

Options

A. hemicellulose
B. lignin
C. sporopollenin
D. lignocelluloses

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for one of the most resistant biological materials known. This implies we need to identify a biological substance that exhibits high resistance to various environmental factors.

2. **Identifying the Candidate**: From the video transcript, sporopollenin is mentioned as a highly resistant biological material. It is the major component of spores and pollen grains.

3. **Properties of Sporopollenin**:
- It is resistant to chemicals and enzymes.
- It is chemically stable and remains unchanged for millions of years (up to 500 million years).
- Its stability and resistance make it a significant biological material.

4. **Conclusion**: Based on the information provided, the answer to the question is sporopollenin, as it is recognized for its exceptional resistance and stability over geological time.

**Final Answer**: One of the most resistant biological materials known is sporopollenin.

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