Which one of the following has not changed for the last several thousand years

Options

A. Pinus excelsa
B. Ginkgo biloba
C. Welwitschia
D. Sequola

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which organism has not changed for the last several thousand years. This implies looking for a species that has remained relatively unchanged in its form and structure over a long period.

2. **Reviewing the Options**: Although the options are not provided in the question, we can infer that one of the options is Ginkgo biloba, based on the video transcript.

3. **Exploring Ginkgo biloba**: Ginkgo biloba is described as the only living species of the division Ginkgoophyta. It is often referred to as a "living fossil," meaning it has remained largely unchanged for millions of years.

4. **Comparing with Other Species**: The transcript mentions that other species, such as Pinus excelsa, Velvete, Chia, and Sequola, have gone extinct or evolved significantly over time. This indicates that they have undergone changes, unlike Ginkgo biloba.

5. **Conclusion**: Since Ginkgo biloba has not changed significantly over the last several thousand years and is known as a living fossil, it is the correct answer to the question.

6. **Final Answer**: The correct answer is **Ginkgo biloba** (Option B).