I was raised on the multi-stage rocket form of Evolution--- you probably were too.
You all know the drill : the lowly bacteria climbed out of the primordial slime, evolved into slightly large microbes and then froze evolution-wise, preserved as in aspic, unchanged, for the next 3.5 billion years.
The microbes evolved into slightly larger amoebas and froze evolutionarily as well.
And so on and so on, ever so slowly up the evolutionary ladder of increasing size and complexity culminating in Civilized Man in the top capsule.
Leaving behind down below ,to float about forever like space junk, countless earlier stages of life.
But as Dr Martin Henry Dawson early demonstrated - the bacteria never actually stopped evolving and are evolving still.
They didn't evolved into something else and then hung about as living fossils - they continued to evolve, as all lifeforms do, 'in situ'.
Sometimes evolving into becoming more complex with bigger active genetic codes, sometimes dropping bits of their genetic code to become less complex ---- and more parasitic.
Rather like us, in fact.
For the ancestors of humans once used to make their own Vitamin C, like almost all other lifeforms still do - but then we dropped that ability - became less, not more complex - and now get our life-supporting Vitamin C by living off the avails of others.
Prostitution - the world's third oldest profession ...