the number of species that are known and described range between

Options

A. 1.7 - 1.8 billion
B. 13 - 14 lakh
C. 13 - 14 million
D. 17 - 18 lakh

Answer

To solve the question regarding the number of species that are known and described, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the range of known and described species. We need to identify the specific numbers that represent this range.

2. **Identifying the Range**: According to the information provided, the known and described species range between 1.7 and 1.8.

3. **Clarifying Units**: There is a confusion regarding the units of measurement. The numbers 1.7 and 1.8 are often associated with either lakh (hundred thousand) or million. In this context, they are meant to be interpreted in millions.

4. **Converting to a Common Unit**: To clarify, 1.7 million can be expressed as 17 lakh and 1.8 million as 18 lakh. This helps in understanding the scale of the numbers better.

5. **Finalizing the Answer**: Based on the above information, the range of known and described species is between 1.7 million and 1.8 million, which translates to 17 lakh to 18 lakh.

6. **Selecting the Correct Option**: If the options provided include the range of 17 lakh to 18 lakh, we would select that as the correct answer.

### Conclusion:
The number of species that are known and described ranges between 1.7 million and 1.8 million, or 17 lakh to 18 lakh. The correct option would be option 4 if it corresponds to this range.