2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Placoderms kuj yog thawj ntses los tsim cov pelvic fins, tus ua ntej rau hindlimbs hauv tetrapods, nrog rau cov hniav tseeb. Paraphyletic groupings yog teeb meem, vim hais tias ib tug tsis tuaj yeem tham tau meej txog lawv cov kev sib raug zoo phylogenic, cov yam ntxwv zoo, thiab ua tiav kev ploj tuag.
Puas muaj placoderms ciaj sia hnub no?
Placoderm, ib tus tswvcuab ntawm pawg neeg uas ploj lawm (Placodermi) ntawm cov ntses lub puab tsaig qub paub tsuas yog los ntawm cov pob txha seem. Placoderms muaj nyob thoob plaws lub sijhawm Devonian (kwv yees li 416 lab rau 359 lab xyoo dhau los), tab sis tsuas yog ob hom txuas ntxiv mus rau lub sijhawm ua tiav Carboniferous.
Puas yog placoderms peb cov poj koob yawm txwv?
Cov placoderms yog ib pawg neeg sib txawv ntawm cov ntses armored thaum ub thiab nws tau ntseeg tias lawv yog poj koob yawm txwv rau txhua tus vertebrates ciaj sia niaj hnub no, suav nrog tib neeg.
xyoo twg placoderms tau ploj mus?
Placoderms ploj mus ntau hauv Late Devonian kev ploj tuag txog 364 lab xyoo dhau los, qhov tshwm sim loj zuj zus uas kwv yees li 22 feem pua ntawm tag nrho tsev neeg ntawm cov tsiaj hauv hiav txwv ploj thiab qee qhov 57 feem pua. ntawm genera (McGhee 1996).
Puas placoderms puas muaj pob txha taub hau?
Tsis zoo li tag nrho lwm cov vertebrates lub puab tsaig, placoderms yeej tsis muaj hniav, thiab tsis nqis los ntawm cov poj koob yawm txwv toothed. … Ntxiv peculiarities ntawm lub pob txha taub hau, xws li lub qhov ntswg capsules uas tsis fused mus rau tus so ntawm lub hlwb,Paub qhov txawv placoderms los ntawm tag nrho lwm cov vertebrates lub puab tsaig.
Pom zoo:
Puas pom qhov tseem ceeb yog vim li cas lossis vim li cas ho tsis?
Kev sib txuas lus pom kev pab cov neeg tuaj saib nkag siab cov ntaub ntawv. Nws ua rau kom nkag siab txog cov ntsiab lus. Hom duab ob sab uas pab kev sib txuas lus muaj xws li kos duab, kos duab kos duab, animation, kos npe, typography, graphic designs, thiab lwm yam.
Vim li cas txoj kev tseem ceeb tseem ceeb rau kev tswj xyuas qhov project?
txoj kev tseem ceeb tso cai rau pab pawg txheeb xyuas cov haujlwm tseem ceeb tshaj plaws hauv qhov project. … Qhov no muab kev nkag siab ntau dua rau koj qhov project ncua sij hawm thiab kev sib raug zoo ntawm cov haujlwm, ua rau koj nkag siab ntau ntxiv txog lub sijhawm ua haujlwm twg koj tuaj yeem hloov kho, thiab qhov twg yuav tsum nyob ib yam.
Vim li cas lub ntsiab lus tseem ceeb yog qhov tseem ceeb?
Grand mean centering sub lub ntsiab lus loj ntawm tus kwv yees siv qhov txhais los ntawm tag nrho cov qauv (X).. Vim li cas Grand txhais tau tias qhov chaw tseem ceeb? Lub ntsiab lus tseem ceeb yog qhov siv tau rov ntsuas duauas pab nrog kev txhais cov ntsiab lus cuam tshuam nrog kev cuam tshuam, nws txhais tau li cas, lossis qhov sib txawv ntawm txhua qib;
Dab tsi yog qhov tseem ceeb thiab vim li cas nws tseem ceeb los txheeb xyuas koj qhov tseem ceeb?
Qhov tseem ceeb yuav coj koj hauv kev txiav txim siab hauv lub neej thiab ua rau koj taug qab. Qhov tseem ceeb tshaj plaws, qhov tseem ceeb tshaj plaws yuav ua rau koj ntseeg siab hais tias "tsis yog." Lawv pab koj txheeb xyuas qhov xav tau tiag tiag hauv koj lub neej, piv rau lwm tus xav tias tseem ceeb.
Vim li cas qhov tseem ceeb ntawm qhov muaj zog thiab qhov tsis muaj zog yog qhov tseem ceeb?
Nws yog ib qho tseem ceeb rau qhov tseem ceeb ntawm qhov ua tau zoo thiab qhov tsis muaj zog vim qhov no pab lub tuam txhab txiav txim siab txog thaj chaw uas lawv yuav tsum tau txhim kho ntxiv rau thaj chaw uas lawv ua tau zoo hauv. Vim li cas lub zog thiab qhov tsis muaj zog tseem ceeb?
