This is just my imagination.
So did Earth happen to be supposed to be an habitable planet?
1st of all , creation of the sea is artificial.
The water was delivered from Moon.
Both Earth and Moon were not rotating around current trajectories.
They were originally brothers of satellites of Jupiter or Saturn.
In other words even if current Earth went dead, another appropriate sphere could be transported from Jupiter or Saturn by aliens' billiards.
Inner planets, Mercury, Venus, Earth and Mars, were all results of billiards.
Monkey to Human is not an evolution, but an manipulation.