The Pernian period, during which the first most modern orders of insects appeared, occurred approximately

Options

A. 80 million years ago
B. 150 million years ago
C. 280 million years ago
D. 550 million years ago

Answer

### Step-by-Step Solution

1. **Understanding Geological Time Scale**: The geological time scale is divided into eons, eras, periods, and epochs. The Permian period is part of the Paleozoic era.

2. **Identifying the Eon and Era**: The Permian period falls under the Phanerozoic eon, which is the current eon in the geological time scale. The Phanerozoic eon is further divided into three eras: Paleozoic, Mesozoic, and Cenozoic.

3. **Locating the Permian Period**: The Permian period is the last period of the Paleozoic era. It is essential to know that the Paleozoic era spans from approximately 541 million years ago to about 252 million years ago.

4. **Determining the Time Frame**: The Permian period is estimated to have occurred around 299 to 252 million years ago. To find the time when the first modern orders of insects appeared, we focus on the end of the Permian period.

5. **Identifying the Correct Option**: The question asks for the approximate time when the Permian period occurred. The closest option that fits this time frame is 280 million years ago, which is within the range of the Permian period.

6. **Conclusion**: Therefore, the Permian period, during which the first modern orders of insects appeared, occurred approximately 280 million years ago.