Nug siv yis lub ntiaj teb no ceg txog 150 plhom xyoo dhau los, ua ntej lawv hloov ntawm strut mus slither. … Tsis tas li ntawd, lawv hais tias "molecular machinery" rau kev loj hlob ntawm ceg tseem nyob twj ywm hauv cov nab tom qab ntau lab xyoo - nws tsuas yog hloov mus.
Npaj plam li cas?
Nws yog feem ntau xav tias nab hloov zuj zus los ntawm lizards. Sij hawm dhau mus, lawv ob txhais ceg me me thiab thaum kawg lawv poob tag nrho. Qee hom nab, suav nrog pythons thiab boas, tseem khaws cov seem ntawm lawv ob txhais ceg nrog cov lej me me uas lawv siv los tuav nrog thaum mating.
Npuas nab muaj ob txhais ceg?
Cov pob txha tsis sib xws, feem ntau cov pob txha taub hau, muaj ze li 100 lab xyoo thiab muaj nyob rau ntawm pawg nab uas ploj lawm Najash, uas tseem tuav ob txhais ceg. Cov pob txha hais tias nab poob lawv ob txhais ceg ua ntej duatau ntseeg yav dhau los tab sis kuj tuav rau ntawm lawv ob txhais ceg rau ntau lab xyoo.
nab yuav ua li cas yog tias lawv tsis muaj ceg?
A. Nab yog cov tsiaj reptiles uas tsis muaj ceg. Lawv txav los ntawm kev siv lawv cov leeg los thawb lawv cov nplai tawm tsam hauv av lossis lwm yam khoom. … Thaum nws txias heev, nab tsis tuaj yeem txav nrawm nrawm los ntes lossis zom lawv cov tsiaj.
Neb puas muaj ceg?
Nug tsis muaj ceg, puas yog? … Python thiab boa constrictors muaj cov pob txha me me hauv qab faus rau hauv cov leeg mus rau lawv tus Tsov tus tw kawg. Xws linta, tsis muaj txiaj ntsig lossis tsis zoo rau kev ua haujlwm tshwj xeeb, tau piav qhia tias yog vestigial. Lawv kuj yog cov pov thawj txaus ntshai ntawm cov keeb kwm evolutionary ntawm hom.
