Mammals like reptile originated in:-

Options

A. Jurassic
B. Triassic
C. Cretaceous
D. Permain

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the origin of mammals that resemble reptiles. To answer this, we need to look at the geological time periods and identify when these early mammals existed.

2. **Identifying the Geological Periods**: The options provided include:
- Jurassic (145 million to 66 million years ago)
- Triassic (251 million to 199 million years ago)
- Cretaceous (145 million to 66 million years ago)
- Permian (299 million to 251 million years ago)

3. **Analyzing Each Period**:
- **Jurassic Period**: This period occurred after the first mammals had already appeared. Therefore, it cannot be the origin period for mammals like reptiles.
- **Triassic Period**: This period is significant because it is when the first mammals, specifically therapsids (mammal-like reptiles), coexisted with the ancestors of dinosaurs. This indicates that mammals with reptilian characteristics originated during this time.
- **Cretaceous Period**: Similar to the Jurassic, this period is also after the emergence of early mammals and focuses more on flowering plants and the extinction of dinosaurs.
- **Permian Period**: Although it predates the Triassic, it was primarily characterized by amphibians and fish, and not by mammals.

4. **Conclusion**: Based on the analysis, the correct answer is that mammals like reptiles originated in the **Triassic Period**.

**Final Answer**: Mammals like reptiles originated in the Triassic Period.

---