Imininingwane emisha mayelana nokuzala kwama-dinosaurs ichaze kancane ukuthi kungani ngemuva kokuwa kwe-meteorite zanyamalala ngokushesha okukhulu.
Ososayensi baseFlorida State University bathola ukuthi ama-dinosaurs ayeqandusela amaqanda. Futhi okungenani abanye babo bakwenza isikhathi eside kakhulu - kufika ezinyangeni eziyisithupha. Lokhu kutholakala kungenza izizathu zokuqothulwa kwalezi zilwane zibe sobala. Isibonelo, izinyoni zanamuhla zichitha isikhathi esincane kakhulu ekufukameleni, okwenza zingazweli kakhulu ekuguqukeni okunzima kwemvelo. Cishe, lezo zinguquko zenzeka eminyakeni eyizigidi ezingama-66 edlule, lapho i-asteroid engamakhilomitha ayishumi yawela emhlabeni wethu. I-athikili ebekelwe lokhu ishicilelwe ephephabhukwini i-Proceedings of the National Academy of Science.
Izazi ze-paleontologists zihlaziye ukuthi izingqimba zamazinyo zikhule kanjani ngokushesha emazinyweni emibungu yama-dinosaurs asendulo. Kuyiqiniso, okwamanje sikhuluma ngezinhlobo ezimbili zama-dinosaurs, enye yazo eyayilingana nemvubu, kanti enye - inqama. Ngokwalokhu kuphawula, imibungu ichithe izinyanga ezintathu kuya kweziyisithupha iqanda. Lolu hlobo lwentuthuko luhlukanisa ngokuyisisekelo ama-dinosaurs kuzo zombili izibankwa nezingwenya, nasezinyonini ezichamisela amaqanda isikhathi esingeqile kwezinsuku ezingama-85.
Kubaluleke kakhulu ukuthi ama-dinosaurs angawashiyi amaqanda awo enganakiwe, njengoba ayevame ukucabanga, kodwa ayawaqandusela. Uma bengakwenzanga lokhu, bencike kuphela emazingeni okushisa amahle, khona-ke amathuba okuthi amazinyane abo azalwe abengaba mancane kakhulu, ngoba izinga lokushisa elizinzile alivamisile ukugcinwa isikhathi eside kangako. Ngaphezu kwalokho, esikhathini eside kangaka, amathuba okuthi izilwane ezidla ezinye zingadla amaqanda ande kakhulu.
Ngokungafani nama-dinosaurs, izibankwa nezingwenya aziqedi amaqanda, futhi umbungu ukhula kuwo ngenxa yokushisa kwemvelo. Ngakho-ke, ukukhula kuhamba kancane - kufika ezinyangeni ezimbalwa. Kepha ama-dinosaurs, uma kungenjalo wonke, okungenani amanye ayenegazi elifudumele futhi enezimpaphe. Kungani amaqanda abo akhula kancane? Mhlawumbe, isizathu salokhu bekungusayizi wabo - kuze kufike kumakhilogremu ambalwa, angathinta izinga lokukhula.
Lokhu kutholakala kwenza imicabango yangaphambilini yokuthi ama-dinosaurs avele angcwaba amaqanda awo emhlabathini akunakwenzeka. Izinyanga ezintathu kuya kweziyisithupha, iqoqo lamaqanda elingagadwanga abazali babo lalinamathuba amancane okusinda, futhi isimo sezulu esizinzile sasingenakugcinwa kuyo yonke indawo yalezi zilwane.
Kepha okubaluleke kakhulu, noma ngabe kunezimo zokufukamela, isikhathi eside sokufukamela senza abantu be-dinosaur babe sengozini enkulu uma imvelo yashintsha kakhulu. Lokhu kwenzeka cishe eminyakeni eyizigidi ezingama-66 eyedlule, lapho ubusika obusemkhathini kanye nendlala enkulu yehlela eMhlabeni. Ezimweni ezinjalo, izibankwakazi zazingasakwazi ukuqandusela amaqanda izinyanga, ngoba kwakunzima kakhulu ukuthola ukudla eduzane. Kungenzeka ukuthi yilesi sizathu esidale ukuqothulwa kwabo okukhulu.
