The first cellular form of life did not possibly originate till about

Options

A. 3 billion years ago
B. 2000 million years ago
C. 4.5 billion years ago
D. 50,000 years ago

Answer

**Step-by-Step Solution:**

1. **Understanding the Timeline of the Universe and Earth:**
- The universe is estimated to have formed approximately 15 to 20 billion years ago.
- Earth formed around 4.5 billion years ago.

2. **Origin of Life on Earth:**
- Life is believed to have originated on Earth about 4 billion years ago, which is approximately 500 million years after the formation of Earth.

3. **Chemical and Biological Evolution:**
- The emergence of life involved the transition from inorganic simple molecules to organic molecules.
- Simple organic molecules evolved into complex organic molecules, which behaved like early cellular forms (e.g., protobions, microspheres, coacervates).

4. **First Cellular Life:**
- The first cellular forms of life likely did not originate until about 2,000 million years ago (or 2 billion years ago).
- This indicates that while life began around 4 billion years ago, the first true cells took much longer to develop.

5. **Conclusion:**
- Therefore, the answer to the question is that the first cellular form of life did not possibly originate until about 2,000 million years ago.

**Final Answer:**
The first cellular form of life did not possibly originate till about 2,000 million years ago.

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