The age of the fossil of Dryopithecus on the geological time scale is

Options

A. ` 5 xx 10^(6) ` yr back
B. `25 xx 10^(6)` yr back
C. ` 50 xx 10^(6)` yr back
D. `75 xx 10^(6)` yr back

Explanation

To determine the age of the fossil of Dryopithecus on the geological time scale, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**:
- Dryopithecus is an ancient genus of apes that is considered a connecting link between humans and modern apes.

2. **Understand the Characteristics**:
- Dryopithecus had features similar to both humans and apes, such as a broad jaw and large canines. They also exhibited a semi-erect walking style.

3. **Determine the Geological Era**:
- Dryopithecus existed during the Miocene epoch. The Miocene is a significant period in geological time that is known for the evolution of many mammals, including early apes.

4. **Estimate the Time Frame**:
- Fossils of Dryopithecus have been dated to approximately 20 to 25 million years ago. This time frame places them firmly within the Miocene epoch.

5. **Select the Correct Option**:
- Based on the estimated time of existence (20 to 25 million years ago), we can compare this with the given options in the question. The option that aligns with this time frame is the correct answer.

### Conclusion:
- The age of the fossil of Dryopithecus on the geological time scale is estimated to be **20 to 25 million years ago**, which corresponds to the Miocene epoch.