Question

When did life appear on earth? How long did it take to evolve from non-living systems?

Answer 1

life appears on earth 3.5 billions years ago.
the origin of life is the process by which life has arisen from non living matters such as organic compound

Answer 2

1. Different kinds of gases including water vapour formed the atmosphere on earth.
2. Most of these gases were such that life as we know it today could not survive on it.
3. Because it did not have oxygen necessary for life to survive.
4. It took a long time for the air to develop.
5. Then life appeared on oceans first.
6. It slowly evolved into diverse forms - plants, animals and human beings.