Catastrophic events have repeatedly eliminated most of the life on earth, leaving the remainder to mutate frantically until it finds new forms in which to survive, rebuild, and spread again.
Ideas do the same thing.
“Does every giant-monster-mutation experiment group have to fit your politically correct standards?” snaps Juniper.
Behind them, primeval kaiju bat at F-14s. Akikai takes a ReversoRay blast and shrinks, squeaking, down into his pink bipedal form; he blushes and covers himself.
“Well, yes,” says Kliptus, “so things like the Tuskegee study–”
“That’s different,” says Juniper, as something squirms and wriggles in his head, trying to evolve.