No Moon Means No Life On Earth

Without our incredible satellite, LUNA, this planet would never have been able to kick-start life nor hold onto it.  Our single moon is able to bring water into tide pools - and when Earth was young it was in these shallow, wet areas that the first single-cellular life got its start.  If the water hadn't been able to ebb and flow, the most simple of organic life - bacteria - couldn't have survived.  
We owe it all to Luna.