Evolutionary biologists have postulated evolutionary accounts of these traits. <ref>[http://www.talkorigins.org/faqs/bombardier.html Bombardier Beetles and the Argument of Design by Mark Isaak, 1997]</ref> | Evolutionary biologists have postulated evolutionary accounts of these traits. <ref>[http://www.talkorigins.org/faqs/bombardier.html Bombardier Beetles and the Argument of Design by Mark Isaak, 1997]</ref> |