What was earth like 1.7 billion years ago

1. What happened 1.7 billion years ago?
2. What is 90% of Earth's history?
3. What did Precambrian Earth look like?
4. What era is oldest?

What happened 1.7 billion years ago?

Life is still found only in the ocean, but sometime around 1.7 billion years ago, single-celled creatures appeared that had a real nucleus. Another important change is about to happen: true multi-celled life is about to appear, some 30 million years before the end of the Proterozoic.

What is 90% of Earth's history?

The Hadean, Archean, and Proterozoic eons together are called Precambrian time and make up almost 90 percent of Earth's history.

What did Precambrian Earth look like?

The Precambrian was the "Age of Early Life." During the Precambrian, continents formed and our modern atmosphere developed, while early life evolved and flourished. Soft-bodied creatures like worms and jellyfish lived in the world's oceans, but the land remained barren.

What era is oldest?

The oldest is the Paleozoic Era, which means “ancient life.” Fossils from the Paleozoic Era include animals and plants that are entirely extinct (e.g., trilobites) or are rare (e.g., brachiopods) in the modern world.