I think…
Sand “plankton” seem to have their own life cycle, and are able to reproduce themselves.
They eat SPICE, and they themselves are eaten by the Giant Worm.
This is the reason the Giant Worm protects the space sands.
The Sand Plankton can evolve into “Sand Trout” (also known as Little makers)
Sand Trout also seem to be able to reproduce on their own.
Sand Trout are attracted to water, and gather together at a source of water in such vast numbers to the point where they will encapsulate the water.
It is the encapsulation of a planet’s water by the Sand Trout that transforms a wet world into a desert world we know as “DUNE”.
When the Sand Trout encapsulate water underground they also produce some waste byproducts in the water that changes the water , and that leads to the build up of CO2 gas.
Eventually this changed water is under enough pressure inside the Sand Trout’s encapsulation that it will “pop” and rise to the surface
This is know as a “Spice Blow”
The Spice Blow spreads a lot of the changed water that had been encased by the Sand Trout onto the dry surface sands.
The dry and and sunlight will turn this changed water into “Spice”
During the explosion found in a “Spice Blow” many of the Sand Trout are killed.
However some escape and enter into a dormant stage where they undergo a physical change and 6 years later are a creature known as a “WORM”
The Worms grow huge, have a very long life span, and feed on Sand Plankton.
so this all started with Sand Plankton, and one creature comes forth out of the life cycle of another…
But where do Sand Plankton come from?
I dont know?
I do know that when a WORM dies, the outer skin of the WORM splits up and gives off Sand Trout.
And I know that Sand Plankton can become Sand Trout under the right circumstances…
But so far i have not been able to prove that Sand Plankton are directly produced by Sand Trout.
If anyone knows, please drop me a email