Masana kimiyya ba sa daina bincike. Abin da ke gaskiya a yau ya zama ƙarya, ko kuma an tabbatar da shi ba daidai ba ne a wata sabuwar manufa. An samo ɗaya daga cikin irin wannan abin da aka samo a ƙarƙashin sararin kankara na Greenland.
Ta hanyar nazarin DNA ɗin da aka samu daga samfuran ƙasusuwan mammoth na Siberian kafin tarihi, masana kimiyya sun gano alamun DNA mafi tsufa a duniya, wanda ke da shekaru miliyan 1.
Ya zuwa yanzu shi ne DNA mafi tsufa a duniya. Tarihi kenan. Amma sabon gwajin DNA daga zamanin Ice a arewacin Greenland ya kawar da duk waɗannan tsoffin ra'ayoyin.
Masana kimiyya sun gano wani DNA na muhalli wanda ya kai kimanin shekaru miliyan 2, kamar sau biyu kamar yadda aka sani a baya. Sakamakon haka, an canja bayanin wanzuwar rayuwa a duniya gaba ɗaya.
Musamman, DNA muhalli, wanda kuma aka sani da eDNA shine DNA wanda ba a samo shi kai tsaye daga sassan jikin dabba ba, a maimakon haka an dawo dashi bayan ya gauraya shi da ruwa, kankara, ƙasa, ko iska.
Tare da burbushin dabba da wuya a samu, masu binciken sun fitar da eDNA daga samfuran ƙasa a ƙarƙashin takardar kankara daga zamanin Ice. Wannan shi ne kwayoyin halitta da kwayoyin halitta suke zubarwa a cikin kewayen su - misali, ta hanyar gashi, sharar gida, tofa ko lalata gawa.
An gano wannan sabon samfurin DNA ta hanyar haɗin gwiwa na masu bincike daga Jami'ar Cambridge da Jami'ar Copenhagen. Masu bincike sun yi imanin cewa wannan binciken ya kasance mai ban sha'awa wanda zai iya bayyana tushen dalilin dumamar yanayi a yau.
A lokacin yanayin zafi na yankin, lokacin da matsakaita yanayin zafi ya kai digiri 20 zuwa 34 Fahrenheit (digiri 11 zuwa 19 a ma'aunin celcius) fiye da na yau, yankin ya cika da nau'in tsirrai da dabbobi da ba a saba gani ba, in ji masu binciken.
Rubutun DNA suna ba da shawarar haɗuwa da tsire-tsire na Arctic, kamar birch birch da shrubs willow, tare da waɗanda galibi suka fi son yanayin zafi, kamar firs da itacen al'ul.
DNA ta kuma nuna alamun dabbobi da suka hada da geese, kuraye, barewa da lemmings. A baya can, ƙwaro da sauran kurege sun kasance kawai alamun rayuwar dabbobi a wurin.
Bugu da kari, DNA ta kuma nuna kaguwar doki da koren algae sun rayu a yankin - ma'ana ruwan da ke kusa ya fi zafi a baya.
Wani babban abin mamaki shine gano DNA daga mastodon, wani nau'in da ba a sani ba wanda yayi kama da haɗuwa tsakanin giwa da mammoth. A baya can, DNA din mastodon da aka samu kusa da shafin Greenland yana da nisa sosai a kudu a Kanada kuma ya kasance mafi ƙanƙanta a cikin shekaru 75,000 kawai.
Hakanan ana iya samun cikakkiyar ra'ayi game da yanayin muhalli shekaru miliyan 2 da suka gabata ta hanyar nazarin waɗannan samfuran eDNA. Wanda zai siffata iliminmu na duniyar da ta gabata a cikin sabuwar hanya, kuma za ta karya tsoffin ra'ayoyi da yawa.
