Abin da ake ɗauka a matsayin shaida a nan
Jagororin suna ba da fifiko ga bita na tsari, meta-bincike, da manyan ƙungiyoyin bincike na dogon lokaci. Inda kawai bayanan lura suke — wanda sau da yawa yakan faru a fannin abinci mai gina jiki, tunda ba zai yiwu a bazu shekaru na abinci ba — an bayyana wannan iyakancewa a cikin rubutu maimakon a ɓoye. Ana amfani da nazarin hanyoyin aiki da na samfurin dabbobi don bayyana yiwuwar, ba a matsayin hujja kawai na sakamako ga ɗan adam ba.