Me ya sa wasu tsoffin dabbobi masu jiki mai laushi suka kasance a cikin burbushi mai cikakken bayani, yayin da na baya da yawa suka ɓace? Binciken da Cambridge ta jagoranta, aka bayyana ranar 8 ga Oktoba, ya ba da shawarar cewa sauyin ƙarfin ƙananan halittu ya sauya yiwuwar adanawa.
Aikin ya shafi collagen, furotin da ke ba naman dabba ƙarfi, da collagenases, enzymes da ke karya shi. Tawagar ta bi tarihin ƙwayoyin gado masu alaƙa a cikin genomes na bakteriya 700, ta kwatanta shi da bishiyar juyin halitta mai kwanan lokaci. An wallafa binciken a Current Biology.
A cewar masu binciken, waɗannan enzymes sun fara kasancewa a ƙananan halittun da ba sa jure oxygen. Saboda haka, a wuraren da oxygen yake, naman dabbar da ta mutu zai iya daɗewa kafin ruɓewa ta yi sauri. Wannan ya ba tsarin samuwar burbushi ƙarin lokaci.
Tawagar ta haɗa yaɗuwar collagenases daga baya zuwa bakteriya masu amfani da oxygen da raguwar adanar naman laushi kusa da sauyin Ediacaran zuwa Cambrian. Shawarar ita ce masu ruɓar da gawa sun sami shiga ƙarin muhalli, don haka lokacin samuwar burbushi kafin lalacewa ya ragu.
Wannan yana sauya yadda ake fahimtar rashin samun burbushi. Rashinsa yana iya nuna abin da ya faru bayan mutuwa, ba tabbatar da cewa dabbar ba ta taɓa rayuwa a wurin ba. Binciken bai kawar da tasirin binne gawa ko cewa babu wani naman laushi na baya da ya tsira ba.
Babban batu shi ne yiwuwar alaƙar juyin ƙananan halittu da tarihin da masana burbushi suke da shi. Burbushi yana ɗauke da bayanin rayuwa da hanyoyin da suka tace ragowarta. Gwada wannan alaƙa zai taimaka wajen bambanta sauyin dabbobi da sauyin damar adana jikinsu a cikin duwatsu.