Puas roundworms nthuav tawm Cephalization?
Puas roundworms nthuav tawm Cephalization?

Video: Puas roundworms nthuav tawm Cephalization?

Video: Puas roundworms nthuav tawm Cephalization?
Video: Ua poj nrauj vim nyiam sib deev. 10/7/2017 - YouTube 2024, Lub peb hlis ntuj
Anonim

Sib piv thiab sib piv cov phiaj xwm lub cev ntawm flatworms nrog roundworms . Zoo sib xws: Ob leeg muaj peb txheej kab mob thiab ob sab symmetry. Nkawd ob leeg muaj anterior thiab posterior xaus cia cephalization tshwm sim. Lub roundworm muaj lub cev kab noj hniav hu ua a coj.

Tom qab ntawd, ib tus tuaj yeem nug, puas yog echinoderms nthuav tawm Cephalization?

Neeg laus echinoderms kev kho mob , nrog rau cnidarians, tam sim no radial symmetry, txhais tau hais tias lawv lub cev qauv raug faib nyob ib ncig ntawm lub hauv paus ntsiab lus. Tag nrho lwm cov tsiaj muaj lateral symmetry nrog rau kev zam ntawm poriferans (lawv tsis muaj symmetry). Echinoderms ua tsis tam sim no cephalization.

Ib sab saum toj no, puas yog roundworms Diploblastic? Ib yam li platyhelminthes, nematodes yog cov kab mob triploblastic, txhais tau tias lawv muaj peb txheej kab mob (ectoderm, mesoderm thiab endoderm).

Tsis tas li lo lus nug yog, tib neeg puas muaj Cephalization?

Piv txwv ntawm Cephalization Peb pawg ntawm cov tsiaj ua kom pom qhov siab ntawm cephalization : vertebrates, arthropods, thiab cephalopod mollusks. Piv txwv ntawm vertebrates suav nrog tib neeg , nab, thiab noog. Tsiaj txhu los ntawm peb pawg nthuav tawm ob sab symmetry, rau pem hauv ntej txav, thiab zoo-tsim lub hlwb.

Cov kab mob dab tsi muaj Cephalization?

Cov no kab mob suav nrog Cnidarians, xws li coral, jellyfish, hiav txwv anemones thiab yooj yim mollusks zoo li scallops. Echinoderms, lossis hiav txwv hnub qub, kuj tsis muaj cephalization . Yuav luag tag nrho tsiaj txhu tsis poob rau hauv ib qho ntawm cov pawg no nthuav tawm qee qib ntawm cephalization.

Pom zoo: