Theory. meet Life, your organic option Requirement.

Life arose to Drain off, or condensate out the stresses of Gravity, the Earth receives, as it shifts in relation too other planets. Most importantly the Gravitational Stresses of the Orbit around the Sun.

:Okay the first problem with this theory is it needs some calculations too account for the perceptions that life arose 1st in the oceans. Sorry, that's for the students to do, not me.