The evolution model is associated primarily with uniformitarianism, but evidence of catastrophism makes the uniformitarian assumption untenable...
AND FWIGHTENS THEM HALF TO DEATH!
Poor babies.
"asteroids and comets have been the foremost agents of environmental annihilation and the key obstacles to the evolution of life. Life has taken root on Earth not because of cometary deliveries of organic material and volatiles but in spite of extensive NEO bombardment."
...or, they've played an indispensible role in the origin of species, *or*, they've happened but had the same influence as poppin' a zit, *or*...
;')