Conversation about planets

Fatima:Which is the biggest planet?i
Naglaa:Ithink it is Jupiter.
Fatima:Is Mars the smallest one?i
Naglaa:Yes,of course
Fatima:My teacher told us that the only planet we can live
on is the Earth
Naglaa:Why?i
Fatima:Because there is a gravity and four seasons
Naglaa:thank you Fatima for your information
Iliked them a lot.....