Cov pov thawj muaj zog heev no yeej ib txwm taw qhia ncaj qha rau lub hauv paus chiv keeb ntawm cov vertebrate los ntawm ib co daim ntawv ntawm cov segmented pab pawg neeg ntawm invertebrates, annelid los yog arthropod, nyob rau hauv uas tus thawj œsophagus tau hloov dua siab tshiab rau hauv infundibulum, thiab lub qhov ncauj tshiab tsim..
Dab tsi hloov zuj zus los ntawm arthropods?
Nws zoo nkaus li tias arthropods hloov zuj zus los ntawm tib lub hauv paus raws li cov annelids thiab tias peb cov kab tseem ceeb ntawm arthropods - Chelicerata, the Crustacea thiab Insecta - hloov zuj zus ntawm nws tus kheej. cov poj koob yawm txwv. Me ntsis paub txog cov poj koob yawm txwv ntawm cov neeg nyob arthropods.
Puas yog arthropods hloov zuj zus ua ntej?
Thawj fossil arthropods tshwm sim hauv Cambrian Lub Sijhawm(541.0 lab rau 485.4 lab xyoo dhau los) thiab tau sawv cev los ntawm trilobites, merostomes, thiab crustaceans. Tsis tas li ntawd tam sim no yog qee qhov enigmatic arthropods uas tsis haum rau ib qho ntawm cov subphyla uas twb muaj lawm.
Puas vertebrates hloov zuj zus los ntawm ib tug poj koob yawm txwv?
Tib neeg thiab tag nrho lwm yam tsiaj pob txha nraub qaum-ntxiv rau ob peb lwm tus uas tsis muaj pob txha txhua-suav nrog cov pob txha. Vertebrates yog ib tug clade, txhais tau hais tias tag nrho cov tswv cuab ntawm pab pawg muaj hloov zuj zus los ntawm ib tug poj koob yawm txwv uas lawv txhua tus sib koom.
Puas yog arthropods vertebrates?
Arthropods yog ib lub phylum uas suav nrog kab thiab kab laug sab. Lawv yog invertebrates, uas txhais tau tias lawv tsis muaj lub cev pob txha thiab qaum.
