<prompt> Fingqa isihloko: Zaziphakathi kwezidalwa zokuqala ezahlasela umhlaba phakathi nenye yezinguquko ezinkulu zokuziphendukela kwemvelo emlandweni woMhlaba. Manje, ososayensi bakholelwa ukuthi ama-vertebrate okuqala anemilenze emine, aziwa ngokuthi ama-tetrapods, aphila eminyakeni eyizigidi ezingu-360 edlule kungenzeka ayefana kakhulu nezingwenya zanamuhla kunalokho obekucatshangwa ngaphambili. Bakwazi ukwakha kabusha ikhanda lesinye salezi zilwane ngo-3D kusukela ezingxenyeni zezinsalela ezitholakale eMpumalanga yeGreenland. Ososayensi baye bakha kabusha uqweqwe lwe-tetrapod oludala iminyaka eyizigidi ezingu-360 besebenzisa izingcezu zamathambo, ukuze baveze ukuthi lwalunokuma okufana nokwengwenya yanamuhla. Isithombe esingenhla sibonisa ikhanda elihlanganisiwe kanye nemihlathi engezansi, phakathi kwesithombe sibonisa isidumbu sobuso sangakwesokudla ngokubukeka okuqhumile futhi ingaphakathi lamathambo kanye nesithombe esingezansi sibonisa umhlathi ongezansi futhi ngokubukeka okuqhumile. Amathambo ngamanye aboniswe ngemibala ehlukene. I-Acanthostega gunnari yayiphila eminyakeni ephakathi kwezigidi ezingu-380 nezingu-360 edlule lapho izilwane zenza ushintsho zisuka olwandle ziya ezweni. Ososayensi bahlatshwa umxhwele yilezi zinhlobo zezilwane ngoba kucatshangwa ukuthi zibalulekile ekuqondeni ukwakheka kwezitho zomzimba nezemvelo zama-tetrapod okuqala. Nokho, ngemva kwamakhulu ezigidi zeminyaka zingcwatshwe emhlabathini, izinsalela zivame ukulimala futhi zihlanekezelwe. Bathola ukuthi ubuchopho obakhiwe kabusha babunendawo ende ngemva komgudu wendlebe kanye nomhlathi ongaphansi onamathele kakhulu kunalokho obekucatshangwa ngaphambili, okwenza ukuba bufane nezingwenya zanamuhla. Kuboniswa ingwenya yasemanzini anosawoti. Ukuziphendukela kwemilenze yangemuva kwaqala njengamaphiko athuthukisiwe, ngokusho kocwaningo olwanyatheliswa ngonyaka odlule. Abacwaningi bathola ithanga elingasetshenziswanga kahle kanye nesipikili se-pelvic esiyingxenye ethunjini elineminyaka eyizigidi ezingu-375 ubudala lohlobo olwalushintshile, iTiktaalik roseae, phakathi kwezinhlanzi nezilwane zokuqala ezinemilenze. Lokhu kutholakala kuphikisa inkolelo-mbono ekhona yokuthi izitho ezinkulu ezingemuva ezihambayo zakheka kuphela ngemva kokuba izilwane ezinomgogodla sezishintshele ezweni. Umlobi ohambisana nalolu cwaningo uDkt. Neil Shubin, waseYunivesithi yaseChicago, wathi: Imibono yangaphambili, esekelwe emininingwaneni engcono kakhulu etholakalayo, ithi...  <response>: Abacwaningi baseNyuvesi yaseBristol bahlola amathambo ka-Acanthostega gunnari. I-tetrapod yasendulo, noma izilwane ezinemilenze emine ezinomgogodla, yayiphila eminyakeni eyizigidi ezingu-360 edlule. Ochwepheshe bakha imodeli yekhompyutha eyi-3D ukuze bakhe kabusha ukuma kogebhezi. Sifana kakhulu nesigaxa sengwenya yanamuhla kunalokho obekucatshangwa ngaphambili. 