Fossils of oldest land animals date back to

Options

A. `300` million years
B. `350` million years
C. `395` million years
D. `550` million years

Answer

To answer the question about the age of the fossils of the oldest land animals, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Question**: We need to determine when the fossils of the oldest land animals date back to.

2. **Review the Options**: The options provided are:
- A) 300 million years
- B) 350 million years
- C) 395 million years
- D) 550 million years

3. **Understand the Context**: The question refers to the fossils of the oldest land animals. It's important to note that the earliest land animals were not necessarily the same as the first animals to appear on Earth.

4. **Research Fossil Records**: The transcript mentions trilobites, which are marine arthropods that first appeared around 542 million years ago during the Cambrian period. However, the focus here is on the oldest land animals.

5. **Determine the Correct Time Frame**: The oldest land animals are believed to have appeared much later than trilobites. The correct age for the oldest land animals is around 395 million years ago, which corresponds to the Devonian period.

6. **Eliminate Incorrect Options**:
- 300 million years is too recent.
- 350 million years is also too recent.
- 550 million years refers to the appearance of trilobites, not land animals.

7. **Select the Correct Answer**: Based on the information, the fossils of the oldest land animals date back to **395 million years**.

### Final Answer:
The fossils of the oldest land animals date back to **395 million years** (Option C).

---