Amniotic fluid

Amniotic fluid was a liquid which "life [came] from".

When Scaroth tried to take off from the Atlantic Ocean in his ship, its systems failed and the resulting crash created a spark which reacted with the fluid present in the ocean, creating life on Earth. (TV: City of Death)

The Moon also had amniotic fluid, because inside the Moon, there was a creature, waiting to hatch. (TV: Kill the Moon)