According to Darwin one acre of land may contain

Options

A. About 100,000 earth worms
B. About 50,000 earth worms
C. About 20,000 earth worms
D. None of the above

Answer

To solve the question regarding how many earthworms one acre of land may contain according to Darwin, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the number of earthworms that Charles Darwin estimated could be found in one acre of land.

2. **Identifying Relevant Information**: We need to recall information related to Darwin's studies on earthworms, particularly from his book "Formation of Vegetable Mould through the Action of the Worms."

3. **Recalling Darwin's Estimate**: In the mentioned book, Darwin estimated that one acre of land could contain around 50,000 earthworms.

4. **Evaluating the Options**: The options provided are:
- A) About 100,000 earthworms
- B) About 50,000 earthworms
- C) About 20,000 earthworms
- D) None of the above

5. **Selecting the Correct Answer**: Based on Darwin's estimate, the correct answer is B) About 50,000 earthworms.

6. **Conclusion**: Therefore, according to Darwin, one acre of land may contain approximately 50,000 earthworms.

### Final Answer:
**B) About 50,000 earthworms**

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