The first cellular forms of life appeared on earth about________million years ago (mya)

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the time when the first cellular forms of life appeared on Earth, specifically in millions of years ago (mya).

2. **Identifying the First Cellular Life**: The first cellular forms of life that appeared on Earth are known as prokaryotes. Prokaryotes are single-celled microorganisms that lack a defined nucleus and membrane-bound organelles.

3. **Estimating the Timeframe**: Based on scientific research and geological evidence, it is estimated that the first prokaryotic life forms appeared on Earth approximately 2000 million years ago.

4. **Final Answer**: Therefore, the first cellular forms of life appeared on Earth about **2000 million years ago (mya)**.

---