The moon's tides helped biochemistry to develop
There's discussions about the subject, but let's put one explanation: without moon, we would not exist, or not exist yet. Without strong tides in coastal regions, certain basic biochemical processes would slow down extremely, or not occur.
we've still got a little tide left..
Probably life would slow down, not be cancelled: there will be tides: the solar tide is about half the lunar tide. So without moon, we're left with 33% of the tidal effects. The tide would occur every day, shifting over the day during the year.
shallow water zones have max tides
In coastal zones, shallow water, the tides have max influence. Very early shallow waters may have helped primitive life-building molecules to build self-replicating structures, that is the biochemistry of early life.. pre-DNA. Found a publication in Scientific American about this,
In the early Earth environment, Lathe notes that such fast lunar tidal
oscillations would result in the highly saline low-tide environment
that protonucleic acid fragments would have needed to associate and
assemble complementary molecular strands.
Having bonded in pairs at low tide, these newly formed molecular
strands would then dissociate at high tide, when salt concentrations
were reduced, providing what Lathe terms a self-replicating system.
Lathe believes that DNA would ultimately have arisen from such
There could be some kind of "goldilock size" for moons. The earth as an ideal size moon for strong (meters) water tides, but limited tectonic influence. On Mars, tides from moons and sun will have been tiny, so it is doubtful if life ever emerged on Mars, it will have been slowed down irt Earth.
second wave of new life: Cambrium
Also, later on in evolution, when the Cambrian Explosion occured, higher life forms (ca 500M years before humans) thrived in shallow water zones. The abundance of calcium available in ocean water played a role there.. and the food: plant life profiting from the tides.