Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Kuchera kwakatangazve paWalcott Quarry neGeological Survey yeCanada pasi pekunyengetedzwa kwenyanzvi ye trilobite Harry Blackmore Whittington, uye chimbambaira chitsva, Raymond, chakatangwa anenge mamita makumi maviri kumusoro kweFossil Ridge. Whittington, achibatsirwa nevadzidzi vanotsvakurudza Derek Briggs naSimon Conway Morris veYunivhesiti yeCambridge, akatanga kuongororazve Burgess Shale, uye akazivisa kuti mhuka dzinomiririrwa dzakanga dzakasiyana-siyana uye dzisingawanzo kupfuura izvo Walcott akanga aziva. Zvechokwadi, mhuka dzakawanda dzaivapo dzakanga dziine zvimiro zvisinganzwisisiki uye dzaingoratidza kufanana kuduku-duku nedzimwe mhuka dzinozivikanwa. Mienzaniso yacho inosanganisira Opabinia, ine maziso mashanu uye mhino yakaita somuchina wokuchenesa uye Hallucigenia, iyo yakatanga kuvakwazve yakatendeuka, ichifamba pamakwenzi maviri akaenzana.  Mubvunzo: Ndiani akabatsira Whittington?
Derek Briggs naSimon Conway Morris