Piv txwv li, tag nrho cov ntses chondrichthyan muaj fertilization sab hauv, qhov twg cov txiv neej nrog cov poj niam thiab siv ib qho ntawm nws cov khub claspers (cov kab mob tsis sib haum xeeb) los hloov cov phev mus rau nws cov me nyuam. txoj kev rau qe fertilization. … Txiv neej txoj kev loj hlob nyob rau sab laug, thiab poj niam nyob sab xis.
Chondrichthyes noj li cas?
Rays noj feem ntau ntses thiab invertebrates nrog lawv cov hniav blunt Qee tus txawm haus plankton thiab cov kab mob me. Nyob nruab nrab ntawm tus shark thiab lub rays, ob tug tsiaj prey ntawm yuav luag txhua yam uas ua luam dej. … Feem ntau cov rays ua pa los ntawm kev nqus dej los ntawm cov qhov qhib loj ntawm lub taub hau.
Pob ntses cartilaginous nteg qe?
Cartilaginous ntses feem ntau ua ob peb, loj, qesthiab muaj tus nqi qis dua. … Cov poj niam tsawg kawg ib hom shark yog paub khaws lawv cov qe qe tom qab tso lawv, thiab ua tib zoo muab lawv tso rau hauv qhov chaw zes tsim nyog.
Puas Chondrichthyes puas muaj placenta?
Chimaeras, skates, thiab qee qhov sharks yog oviparous. Viviparity yog suav nrog yolk sac placentalossis yog aplacental. … Cov chaw nyob pelagic, cov neeg laus loj, qe-embryo loj, pub ecology, thiab embryonic osmoregulation yog yam tseem ceeb hauv kev tuav ntawm oviparity lossis evolution ntawm viviparity.
Yuav ua li cas yog 3 hom kev yug me nyuam hauv cov ntses cartilaginous?
Tsis zoo li feem ntau cov ntses ntses, txhua tus chondrichthyans muaj fertilization sab hauv. Kev yug me nyuam tuaj yeem yog oviparous (ntev qe, tshwj xeeb tshaj yog "mermaid's purses" pom ntawm ntug hiav txwv dej) , viviparous (nyob-cov kabmob), lossis ovoviviparous (qe nqa hauv niam).
