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

Options

A. `2.5xx10^(6)` years back
B. `50xx10^(6)` years back
C. `75xx10^(6)` years back
D. `25xx10^(6)` years back

Answer

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

### Step-by-Step Solution:

1. **Understand the Geological Time Scale**: The geological time scale is a system that relates geological strata to time. It is divided into eons, eras, periods, epochs, and ages.

2. **Identify the Fossil**: The fossil in question is that of Dryopithecus, which is an important genus in the study of human evolution.

3. **Research the Age of Dryopithecus**: Dryopithecus is known to have lived during the Miocene epoch. Research indicates that it existed approximately 20 to 25 million years ago.

4. **Select the Correct Option**: Given the options provided:
- 2.5 x 10^6 years ago (2.5 million years)
- 50 x 10^6 years ago (50 million years)
- 75 x 10^6 years ago (75 million years)
- 25 x 10^6 years ago (25 million years)

The age of Dryopithecus aligns with the last option, which is 25 x 10^6 years ago (or 25 million years ago).

5. **Conclusion**: Therefore, the correct answer is that the age of the fossil of Dryopithecus on the geological time scale is 25 million years ago.

### Final Answer:
The age of the fossil of Dryopithecus on the geological time scale is **25 x 10^6 years ago**.

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