The first fossils of eukaryotic cells show up in rocks that are about_______billion years old.

Options

A. 0.5
B. 1.5
C. 2.5
D. 2

Answer

To determine the age of the first fossils of eukaryotic cells, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Cells**:
- There are two main types of cells: prokaryotic and eukaryotic. Prokaryotic cells are simpler and do not have a nucleus, while eukaryotic cells are more complex and have a defined nucleus.

2. **Identify the Timeline of Cell Evolution**:
- Prokaryotic cells are believed to have appeared first, around 3.5 billion years ago.
- Eukaryotic cells emerged later in the evolutionary timeline.

3. **Locate the Fossil Evidence**:
- The first fossils of eukaryotic cells are found in rocks that date back to approximately 1.5 billion years ago.

4. **Analyze the Options**:
- The question provides multiple-choice options for the age of the first fossils of eukaryotic cells. The options include:
- 0.5 billion years ago
- 1.5 billion years ago
- 2 billion years ago
- 2.5 billion years ago

5. **Select the Correct Answer**:
- Based on the information gathered, the correct answer is **1.5 billion years ago**.

### Final Answer:
The first fossils of eukaryotic cells show up in rocks that are about **1.5 billion years old**.

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