Petroleum was formed from organisms

Options

A. living on the land
B. living on the plants
C. living in the sea
D. living on the rocks

Answer

**Step-by-Step Solution:**

1. **Understanding Petroleum Formation:**
- Petroleum is a natural resource that is formed from the remains of ancient organisms. It is primarily composed of hydrocarbons and is used as a fuel source.

2. **Identifying the Source Organisms:**
- The organisms that contribute to the formation of petroleum are primarily marine organisms. Specifically, petroleum is formed from the remains of tiny sea creatures.

3. **Role of Zooplankton:**
- The primary organisms responsible for the formation of petroleum are zooplankton. These are microscopic organisms that live in the ocean.

4. **Process of Formation:**
- When these marine organisms die, their remains settle on the ocean floor. Over millions of years, they become buried under layers of sediment and rock.

5. **Conditions for Transformation:**
- Under high temperature and pressure, the organic material from these organisms undergoes chemical changes, transforming into petroleum.

6. **Conclusion:**
- Therefore, the correct answer to the question of which organisms petroleum is formed from is zooplankton, as they are the marine organisms that contribute to the formation of petroleum under specific geological conditions.

**Final Answer:**
Petroleum was formed from zooplankton, which are marine organisms.

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