Eukaryotes developed around

Options

A. 1,600 million years ago
B. 459 million years ago
C. 3,800 million years ago
D. 4,200 million years ago

Answer

To answer the question "Eukaryotes developed around," we need to analyze the options provided and understand the timeline of the evolution of life on Earth.

### Step-by-Step Solution:

1. **Understanding Earth's Timeline**:
- The Earth was formed approximately 4 billion years ago. This is the starting point for understanding the development of life.

2. **First Life Forms**:
- The first life forms, which were prokaryotic cells (simple cells without a nucleus), appeared around 3.5 billion years ago. This indicates that life began with simpler organisms before evolving into more complex forms.

3. **Introduction of Eukaryotes**:
- Eukaryotes are complex cells that contain membrane-bound organelles, including a nucleus. The development of eukaryotes is a significant milestone in the evolution of life.

4. **Timeline for Eukaryotic Development**:
- Eukaryotes are believed to have developed approximately 1.6 to 2.1 billion years ago. This timeframe is crucial as it marks the transition from simple prokaryotic life to more complex eukaryotic life.

5. **Conversion to Million Years**:
- Since the question asks for the time in million years ago, we convert the billion years into million years. Therefore, 1.6 billion years ago is equivalent to 1600 million years ago.

6. **Selecting the Correct Option**:
- Among the options provided:
- 1600 million years ago
- 459 million years ago
- 3800 million years ago
- 4200 million years ago
- The correct answer is 1600 million years ago, as it aligns with the estimated timeline for the development of eukaryotes.

### Final Answer:
Eukaryotes developed around **1600 million years ago**.

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