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SHOWDOWN ON THE BURGESS SHALE

Across
The scientist who challenges the claims made by Stephen Jay Gould
The period of 20 million years where marine invertebrate life seemed to have "exploded," reaching the fully modern range
What Gould says if we were to rewind and play again, humans would surely not be found to come into existence
The area that contained a vast fossil array between 2 peaks of the Canadian Rockies
He believes life on other planets seems likely, while consciousness comparable to our own might be so rare and chancy it only exists here
The species Morris mistakenly characterized upside down
Down
The publication that captured Gould's findings as well as his personal beliefs about the nature of evolution
Of what Gould asks, "how can anyone defend the inevitability of its convergent evolution?"
The reason why dolphins resemble fish while having evolved from doglike mammals
"An armored slug with a trig shell at either end"
What even conservative estimates say has not grown in number since the Cambrian Explosion
"a creature still in the process of becoming an annelid"