Origin of first toothed birds and gymnosperms took place during

Options

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

Answer

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about the origin of the first toothed birds and gymnosperms, specifically during which geological period this occurred.

2. **Identify the Geological Periods**: The options given are Cretaceous, Jurassic, Triassic, and Permian. It is important to know the time frames and characteristics of these periods.
- **Cretaceous**: 145.5 to 66 million years ago; known for the dominance of flowering plants and the extinction of dinosaurs.
- **Jurassic**: 199.6 to 145.5 million years ago; characterized by the dominance of dinosaurs and the emergence of the first birds.
- **Triassic**: 252 to 201 million years ago; marked by the rise of dinosaurs and the first mammals.
- **Permian**: 299 to 252 million years ago; known for the diversification of amphibians and the dominance of reptiles.

3. **Focus on the Jurassic Period**: The video transcript indicates that the first toothed birds originated during the Jurassic period. This period is known for significant evolutionary developments, particularly in reptiles and the emergence of the first birds.

4. **Consider the Gymnosperms**: The transcript also mentions that gymnosperms were the dominant plants during the Jurassic era. Gymnosperms are cone-bearing plants that reproduce via seeds and were prevalent during this time.

5. **Conclusion**: Based on the information gathered, the origin of the first toothed birds and gymnosperms took place during the Jurassic period.

6. **Final Answer**: The correct option is **Jurassic**.