Hiav txwv dib ua lub luag haujlwm tseem ceeb hauv cov txheej txheem marine raws li lawv pab rov siv cov khoom noj, rhuav tshem cov detritus thiab lwm yam khoom organic tom qab uas cov kab mob tuaj yeem txuas ntxiv cov txheej txheem degradation.
Holothuroidea noj li cas?
Raws li kev ncua lossis tso nyiaj pub noj holothurians ntxiab hais thiab plankton ntawm cov mucus-npog tentacles. Cov tentacles raug thawb rau hauv lub qhov ncauj kom noj zaub mov.
Lub ntsiab lus ntawm Holothurians yog dab tsi?
holothurian. [hŏl′ə-thur′ē-ən, hō′lə-] Ib yam ntawm ntau yam echinoderms ntawm chav kawm Holothuroidea, tus yam ntxwv ntawm lub cev elongated nrog tentacles nyob ib ncig ntawm lub qhov ncauj thiab tsib kab ntawm lub raj taw. Holothurians yog softer dua li lwm yam echinoderms vim lawv tsis muaj spines thiab lub cev pob txha yog heev txo.
Tus yam ntxwv ntawm Holothuroidea yog dab tsi?
Class Holothuroidea
- Lack arms.
- Bilaterally symmetrical.
- Lub cev phab ntsa mos ntau dua li calcareous.
- Dioecious nrog ib tus gonad.
- Sedimentary feeders.
- Lub cev puag ncig lub raj taw.
- Interior madreporite.
- Txiv kab ntsig nyob ib puag ncig lub qhov ncauj uas yog kab nrog hloov kho cov hlab ntsha.
Cab hiav txwv ua li cas thaum raug hem?
Kev Tiv Thaiv Kev Tiv Thaiv. Thaum muaj kev hem, qee cov ntses hiav txwv tso cov nplaum nplaum kom ntes lawv cov yeeb ncuabLwm tus tuaj yeem cuam tshuam lawv lub cev raws li kev tiv thaiv. Lawv ua phem rau lawv cov leeg nqaij thiab jettison qee yam ntawm lawv lub cev sab hauv tawm ntawm lawv qhov quav.
