The earth possesses all the essential features necessary for maintaining the life-system. It is provided with atmosphere and hydrosphere along with the lithosphere. Moreover the average temperature of 17°C is ideal for survival.
Three points of comparison with respect to other planets are as follows.
1. Other planets are either too hot or too cold that are unfavourable for life.
2. Other planets are devoid of atmosphere and hydrosphere and some are surrounded by poisonous gases.
3. Other planets are devoid of fresh water bodies, like rivers and lakes.
