What is period of origin of first eukaryote?

Explanation

**Step-by-Step Solution:**

1. **Understanding Eukaryotes and Prokaryotes:**
- Eukaryotes are complex organisms with a defined nucleus and organelles, while prokaryotes are simpler, single-celled organisms without a nucleus.
- The first life forms on Earth were prokaryotes, which emerged approximately 3000 million years ago.

2. **Evolution of Eukaryotes:**
- Eukaryotes evolved from prokaryotic ancestors. The transition from prokaryotic to eukaryotic life forms marks a significant step in the evolution of life on Earth.
...