The fossil record offers direct evidence for common descent because you can

Options

A. see that the types of fossils change over time
B. sometimes find common ancestors.
C. Trace the ancestry of a particular group.
D. Trace the biological history of living things.

Answer

**Step-by-Step Solution:**

1. **Understanding Common Descent**: Common descent is the concept that all living organisms share a common ancestor. This idea is fundamental to the theory of evolution.

2. **Role of Fossils**: Fossils are the preserved remains or impressions of organisms from the past. They provide a historical record of life on Earth.

3. **Fossil Record Evidence**: The fossil record offers direct evidence for common descent by showing a chronological sequence of life forms. By examining the layers of rock and the fossils within them, scientists can trace the evolution of species over time.

4. **Transitional Fossils**: Transitional fossils are particularly important as they exhibit traits that are intermediate between different groups of organisms. For example, fossils of ancient birds show features that are both reptilian and avian, indicating a transition from dinosaurs to modern birds.

5. **Comparative Anatomy**: By comparing the anatomical structures of different species, scientists can identify similarities that suggest a common ancestry. Fossils that show these similarities reinforce the idea of common descent.

6. **Geological Time Scale**: The fossil record is organized according to the geological time scale, which helps in understanding the timeline of evolution. This scale shows how different species appeared and evolved over millions of years.

7. **Conclusion**: Therefore, the fossil record provides direct evidence for common descent by documenting the history of life, showcasing transitional forms, and allowing for comparisons between extinct and living species.