Earth has several "just right" features that allow it to support life and make it the only planet we know of to do so.

Earth has several "just right" features that allow it to support life and make it the only planet we know of to do so. What are the features of the Earth that make it unique among the planets in its ability to support life?

I need 1-2 paragraphs. 

I need the solution in 2 hours.