Ntaus raws li peb paub niaj hnub no - lub cev lub cev, qhov siab loj, cov nplooj ntoo lossis fronds - tsis tshwm sim hauv ntiaj teb kom txog rau thaum lub sijhawm Devonian lig, qee qhov 360 lab xyoo dhau los. Tej zaum koj yuav xav tsis thoob thaum kawm tias sharks laus dua ntoo raws li lawv tau nyob ib puag ncig tsawg kawg 400 lab xyoo.
Leej twg tuaj thawj shark lossis ntoo?
1. Sharks yog laus dua trees. Sharks tau muaj nyob rau ntau tshaj 450 lab xyoo, thaum tsob ntoo ntxov tshaj plaws, nyob ib ncig ntawm 350 lab xyoo dhau los. Tsis tsuas yog sharks laus dua ntoo, tab sis lawv kuj yog ib qho ntawm cov tsiaj xwb uas tau muaj sia nyob plaub ntawm tsib qhov kev ploj tuag - tam sim no yog qhov txaus nyiam.
xyoo twg ntoo vs sharks?
Zoo qhov tseeb: Sharks tau nyob ib puag ncig ntev dua ntoo
Around 360 lab xyoo dhau los, tam sim no-tuag tsob ntoo Archaeopteris tau tsim ua ntej rau tsob ntoo niaj hnub no, raws li kev tshawb fawb xyoo 1999 los ntawm Virginia Tech.
Tsiaj twg laus dua tus shark?
Elephant Shark Txawm tias nws lub npe, ntxhw shark tsis yog shark, tab sis yog hom ntses cartilaginous. Nws belongs rau ib pawg ntses hu ua ratfish, uas diverged los ntawm sharks txog 400 lab xyoo dhau los. Lawv ntseeg tias yog ib hom kab mob vertebrate qub tshaj plaws.
Yuav ua li cas tsiaj nyob ib ncig ntawm ua ntej ntoo?
Peb hom ntau dua li qub dua ntoo thiab: nautiluses, horseshoe crabs,thiab jellyfish. Tag nrho cov tsiaj dej no tau hu ua "cov pob txha muaj sia."
