Cov pov thawj Fossil qhia meej meej tias marsupials originated in the New World. Cov pob txha loj tshaj plaws uas paub txog marsupial (uas tau pom nyob rau hauv Suav teb thiab North America) hnub tim kwv yees li 125 lab xyoo dhau los, thaum lub sijhawm Cretaceous (145 txog 66 lab xyoo dhau los).
marsupials keeb kwm nyob qhov twg?
Kev tshuaj xyuas ze dua tau qhia tias South American opossum xaj, Didelphimorphia, yog qhov qub tshaj plaws nyob marsupial xaj, qhia tias tag nrho cov marsupials tuaj hauv South America.
Vim li cas marsupials hloov zuj zus hauv Australia?
Dua, nws tsis paub meej tias vim li cas marsupials vam meej hauv Australia. Tab sis ib lub tswv yim yog tias thaum lub sij hawm nyuaj,cov niam marsupial tuaj yeem jettison txhua tus me nyuam loj hlob uas lawv muaj hauv lawv lub hnab, thaum cov tsiaj txhu yuav tsum tau tos kom txog thaum cev xeeb tub tas, siv cov peev txheej muaj txiaj ntsig rau lawv cov hluas, Beck hais.
Opossums tau mus rau North America li cas?
Tab sis tom qab Isthmus ntawm Panama tau tshwm sim los txuas rau North thiab South America 3 lab xyoo dhau los, ob marsupials tau rov qab mus rau North America: Virginia opossum (Didelphis virginiana), ib tug neeg nyob rau sab hnub tuaj hnub no, thiab sab qab teb opossum (Didelphis marsupialis), uas nyob rau sab qaum teb mus rau Mexico.
Thaum twg marsupials mus txog Australia?
Marsupials mus txog Australia ntawm Antarctica kwv yees 50 mya, tsis ntev tom qab Australia tau sib cais.
