Eukaryotes developed around

Options

A. 1600 million years ago
B. 459 million years ago
C. 3800 million year ago
D. 4200 million year ago

Answer

**Step-by-Step Solution:**

1. **Understanding Eukaryotes**: Eukaryotes are organisms whose cells contain a nucleus enclosed within a nuclear membrane. This group includes a wide variety of organisms, such as single-celled organisms (like yeast and paramecium) and multicellular organisms (like plants, animals, and fungi).

2. **Timeframe for Eukaryotic Development**: The question asks when eukaryotes developed. Based on scientific evidence, eukaryotes are believed to have emerged around 1.6 billion years ago.

3. **Converting Timeframe**: To express this time in millions of years, we convert 1.6 billion years to million years. Since 1 billion is equal to 1000 million, we multiply:
\[ 1.6 \text{ billion years} = 1.6 \times 1000 = 1600 \text{ million years ago} \]

4. **Comparing Options**: The options provided are:
- 1st: 1600 million years ago
- 2nd: 459 million years ago
- 3rd: 3800 million years ago
- 4th: 4200 million years ago

From our calculation, the correct option is clearly the first one: **1600 million years ago**.

5. **Conclusion**: Therefore, the answer to the question "Eukaryotes developed around" is **1600 million years ago**.

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