Jawless Ntses (Ostracoderms) Tau Tshaj Tawm vim rau Environmental Factors, Range Restriction, not Competition With Jawed Fish. Paub meej: Cov ntaub ntawv fossil ntawm cov vertebrates thaum ntxov tau muaj kev cuam tshuam hauv kev qhia txog kev hloov pauv hloov pauv ntawm lub cev gnathostome.
Thaum twg ostracoderms ploj mus?
txog 420 lab xyoo dhau los, feem ntau hom ostracoderm tau poob qis, thiab cov ostracoderms kawg tau ploj mus ntawm kawg ntawm lub sijhawm Devonian.
Vim li cas cov ntses armored thiaj li ploj mus?
Nws tau xav txog ib lub sijhawm uas placoderms tau ploj mus vim kev sib tw los ntawm thawj cov ntses pob txha thiab cov sharks thaum ntxov, muab kev sib xyaw ua ke ntawm qhov kev xav zoo tshaj plaws ntawm cov nqaij pob txha thiab cov presumed sluggishness ntawm placoderms.
Puas yog conodonts ostracoderms?
Conodonts suav hais tias yog hom ntses lub puab tsaigvim tias txawm tias lawv muaj cov txheej txheem pub mis nrog cov hniav, lawv "lub puab tsaig" ua haujlwm txawv ntawm cov vertebrates tom qab uas lawv lub puab tsaig tau tsim los ntawm kev hloov kho ntawm ib khub ntawm gill arches. … Ostracoderms - thaum ntxov jawless armored ntses.
Vim li cas cov pob txha sab hauv ntawm ostracoderms tsis zoo los yog tsis khaws cia?
Vim cov ostracoderms muaj cov pob txha pob txha, cov pob txha tam sim no suav tias yog ntau dua qub thiab pob txha mos txhais tau tias yog mob degenerate.
