State three factors that have made life possible on the planet earth.
OR
State the conditions favourable for life to exist on earth.

The three factors that have made life possible on the planet earth are:

1. Its distance from the Sun is neither too near nor too far, hence ideal temperature conditions.
2. It has atmosphere containing oxygen and nitrogen necessary to support life.
3. It has water cycle. Presence of water has made existence of life possible on earth. It is essential for all kinds of life.