The solid fossil fuel coal is formed by

Options

A. pteridophytes
B. algae
C. fungus
D. bacteria

Answer

**Step-by-Step Solution:**

1. **Understanding Fossil Fuels**: Fossil fuels are natural substances formed from the remains of ancient plants and animals that have been subjected to heat and pressure over millions of years.

2. **Identifying the Source of Coal**: Among the options provided (A. pteridophytes, B. algae, C. fungus, D. bacteria), we need to determine which organism is primarily responsible for the formation of coal.

3. **Role of Pteridophytes**: Pteridophytes are the first vascular plants that lived on land. They include ferns and their relatives. Millions of years ago, when these plants died, their remains were buried under layers of soil and sediment.

4. **Process of Coal Formation**: As the remains of pteridophytes were buried deeper, they were subjected to high temperatures and pressures over time. This process led to the transformation of their organic material into coal.

5. **Conclusion**: Based on the information about the origin of coal, the correct answer is A. pteridophytes.

**Final Answer**: The solid fossil fuel coal is formed by A. pteridophytes.

---