2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Viviparous sharks muaj placental viviparity. Cov me nyuam shark yuav hnia sab hauv tsev menyuam thiab nyob ntawm qhov chaw mos mus txog thaum lawv npaj yuav yug. Sharks yug los ntawm viviparity yuav muaj txoj hlab ntaws nyob nruab nrab ntawm lub pectoral fins uas xa lawv cov as-ham thiab oxygen los ntawm leej niam cov hlab ntsha.
Txhua tus sharks muaj qhov quav?
Tag nrho 60 hom requiem sharks muaj placenta sib nrug ntawm ib tug: tsov shark. Hloov chaw, raws li kev tshawb fawb tsis ntev los no tau pom, tsov shark niam muab cov khoom noj rau lawv cov embryos los ntawm kev sau cov qe qe nrog lub zog nplua nuj kua.
Yim dab tsi shark yug?
Tsuas yog ob peb tus sharks, zoo li miv sharks, nteg qe. Tab sis saib! Tag nrho cov sharks yug me nyuam sharks, hu ua pups. Mako sharks, bull sharks, txiv qaub sharks, thiab xiav sharks yog ob peb yam piv txwv ntawm sharks uas yug nyob.
3 txoj kev sharks reproduce yog dab tsi?
Nws tuaj yeem nyob ntawm hom nws tus kheej thiab nws qhov loj me, nrog rau ib puag ncig. Muaj plaub txoj kev sib txawv uas sharks reproduce: Viviparous, oviparous, ovoviviparous, thiab asexually.
Yuav ua li cas viviparous sharks reproduce?
Viviparous reproduction yog thaum sharks thiab rays yug me nyuam yaus, ib yam li tsiaj txhu. Hauv qee hom qe yuav hatching hauv niam thiab cov menyuam yug los ciaj sia. Hauv ob peb hom cov menyuam dev tsis yog siv lub qe xwbyolk rau noj tab sis kuj qe unfertilized leej niam tsim los pub nws cov me nyuam.
Pom zoo:
Puas muaj pes tsawg basking sharks nyob hauv lub ntiaj teb no?
Tus basking shark feem ntau raug tua los ntawm lub nkoj thiab nkag mus rau hauv cov nets tib yam li whales, thiab suav tias yog kev phom sij hauv qee qhov chaw hauv ntiaj teb. Hauv Atlantic Canada, cov pej xeem tam sim no kwv yees yog ncig 10, 000 tsiaj.
Vim li cas cov kws kho mob khaws cov placentas?
Kev xa cov placenta tseem hu ua theem peb ntawm kev ua haujlwm. Kev xa ntawm tag nrho cov placenta yog qhov tseem ceeb rau tus poj niam txoj kev noj qab haus huv tom qab yug me nyuam. Cov placenta khaws cia tuaj yeem ua rau los ntshav thiab lwm yam kev mob tshwm sim tsis xav tau.
Cov placentas nyob qhov twg?
Cov placenta tuaj yeem nyob hauv ntau txoj haujlwm hauv tsev menyuam. Qhov chaw tshaj plaws yog nyob rau hauv rov qab, qab tus me nyuam (tom qab placenta), nyob rau hauv pem hauv ntej ntawm tus me nyuam (anterior placenta), thiab nyob rau sab saum toj ntawm lub tsev menyuam (fundal placenta).
Thaum twg cov placentas txav tom ntej?
Feem ntau cov poj niam thawj zaug xav tias lawv tus menyuam txav mus rau qhov chaw nruab nrab ntawm 16 thiab 24 lub lis piam ntawm cev xeeb tub. Nws yog qhov tshwm sim rau cov niam txiv tom ntej kom hnov qhov kev txav mus tom ntej tshaj li cov placenta nyob rau lwm qhov, vim lawv cov placenta cushions cov wriggles thaum ntxov.
Puas tag nrho cov sharks muaj ampullae ntawm lorenzini?
Lub Ampullae ntawm Lorenzini yog cov khoom siv tshwj xeeb hauv lub cev hu ua electroreceptors, qhov chaw uas lawv tuaj yeem tsim lub network ntawm cov mucus-filled pores. Lawv feem ntau pom nyob rau hauv cartilaginousntses (sharks, rays, thiab chimaeras);
