Robert may estimated the total number of species of the world at

Options

A. 1.5 million
B. 30 million
C. 33 million
D. 7 million

Answer

To solve the question regarding Robert May's estimation of the total number of species in the world, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the estimate made by Robert May regarding the total number of species in the world.

2. **Identifying the Options**: The options provided are:
- 1.5 million
- 30 million
- 33 million
- 7 million

3. **Researching Robert May's Contribution**: Robert May is known for his work in ecology and biodiversity. He conducted studies on species richness and diversity.

4. **Analyzing Species Estimates**: In his research, May suggested that the total number of species on Earth is significantly higher than earlier estimates. He indicated that the global species diversity is generally over 7 million.

5. **Selecting the Correct Answer**: Based on Robert May's conclusion, the most accurate estimate he provided is that the total number of species is around 7 million.

6. **Final Answer**: Therefore, the correct answer to the question is **7 million**.