2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Vim tias lawv hloov zuj zus sai, thiab moulted zoo li lwm cov arthropods, trilobites ua haujlwm zoo tshaj plaws fossils, ua rau cov kws tshawb fawb txog hnub nyoog ntawm cov pob zeb uas lawv pom.
Yuav ua li cas hom trilobite siv los ua ib qho index fossil?
Evolution nyob rau hauv ib pab pawg neeg Tracemakers: 'Cruziana' Biostratigraphy. Trilobites yog ib qho tseem ceeb index fossils los ntawm ntau ntawm Paleozoic, thiab lawv evolution yog mirrored, mus rau ib tug txo qis, nyob rau hauv cov ntaub ntawv stratigraphic ntawm trilobite-tsim kab mob fossils.
Puas muaj pob txha yog pob txha pob txha?
Index fossil, ib yam tsiaj lossis tsob nroj khaws cia hauv cov ntaub ntawv pob zeb ntawm lub Ntiaj Tebuas yog tus yam ntxwv ntawm lub sijhawm tshwj xeeb ntawm geology lossis ib puag ncig. Cov pob txha pob txha muaj txiaj ntsig yuav tsum yog qhov sib txawv lossis pom tau yooj yim, muaj ntau, thiab muaj qhov dav ntawm thaj chaw faib khoom thiab ntau yam luv luv los ntawm lub sijhawm.
Yuav ua li cas cov pob txha yuav phem index fossils?
Birds, piv txwv li, yuav ua rau cov fossils phem, vim hais tias txawm hais tias muaj ntau hom uas muaj qhov dav (qhov tseeb intercontinental), lawv fossilize tsis zoo: lawv cov pob txha tuaj sib nrug. yooj yim, thiab tom qab ntawd lawv cov pob txha mos honeycombed muaj qhov cuam tshuam rau kev lwj.
hom tsiaj twg ua pob txha zoo?
Trilobites ua haujlwm zoo li fossils zoo, cia cov kws tshawb fawb pom hnub nyoog ntawm cov pob zeb uas lawv nyob hauv.
Pom zoo:
Dab tsi ua kom pob txha pob txha ntawm cov pob qij txha?
pob txha muab cov duab, txhawb nqa, thiab qauv rau lwm cov ntaub so ntswg hauv lub cev. Nws kuj yuav pab tau cov pob qij txha. Pob txha mos kuj smoothens cov pob txha nto ntawm cov pob qij txha. Cov ntaub so ntswg dab tsi npog cov pob txha ntawm cov pob qij txha?
Puas yog pob txha pob txha pob txha zoo ib yam li meniscus?
Cov pob txha mos yog qhov tawv tab sis du npog ntawm qhov kawg ntawm cov pob txha hauv cov pob qij txha. Nws tso cai rau gliding yam tsis muaj kev tiv thaiv ntau thiab ua haujlwm nrog cov meniscus kom cushion kawg ntawm cov pob txha. Lub meniscus nyob nruab nrab ntawm lub femur thiab tibia.
Dab tsi qhov sib txawv ntawm cov pob txha pob txha thiab pob txha?
Cov pob txha pob txha yog tsim los ntawm osteons thiab tsim cov txheej txheem sab nraud ntawm txhua pob txha. Cov pob txha pob txha yog tsim los ntawm trabeculae thiab ua rau sab hauv ntawm txhua pob txha. Dab tsi yog qhov sib txawv ntawm cov pob txha pob txha thiab pob txha pob txha?
Puas yog pob txha pob txha pob txha?
Muaj kev ntxhov siab raug muab tso rau ntawm pob txha shin, uas yog tibia. Yog tias koj muaj shin splints thiab koj khiav koj cov ntiv tes raws tibia, koj yuav hnov ntau pob. Cov no muaj rau ib qho laj thawj. Koj tuaj yeem muaj ko taw tiaj tus lossis cov arches siab uas cuam tshuam rau lub ntsej muag, koj tuaj yeem muaj lub duav tsis muaj zog uas cuam tshuam rau lub shins.
Puas yog lub pob txha pob txha pob txha pob txha?
CONCLUSIONS: vertebral endplate raug mob feem ntau pom hauv osteoporotic vertebral compression fractures. Dab tsi ua rau lub pob txha tawg? Nws yog kev xav tias, nyob rau hauv ntau qhov mob ntawm qhov mob qis qis, thawj qhov ua rau mob yog pob txha ntawm pob txha caj qaum los ntawm compression rog.
