well, as to the corals, you see:
they built their own walls and retreated inside. when the flood receded, it took away the walls by dissolving them. see, at this time, the top layer had the acid nessecary to destroy these protective structures. that way, while the flood was well above them, they could survive, and they wouldn't entirely die out because the shells were destroyed. also, upon the dissolving, the acid was destroyed, so these corals could survive in the water.
works perfectly.
"Have the Courage to Know!" --Immanuel Kant
" . . .and some nights I just pray to the god of sex and drugs and rock'n'roll"--meatloaf
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