Video: Dab tsi yog qhov tseem ceeb ntawm qhov index fossil?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Index cov pob txha yog siv los ntawm ob qho tib si geologists thiab paleontologists los kawm cov pob zeb thiab hom ntawm yav dhau los. Lawv pab muab lub hnub nyoog txheeb ze rau cov pob zeb txheej thiab lwm yam pob txha pom nyob rau hauv tib txheej.
Xav txog qhov no, dab tsi zoo ua rau Graptolites muaj txiaj ntsig index fossil?
A zoo index fossil yog ib tug nrog plaub yam ntxwv : nws yog qhov txawv, dav, ntau, thiab txwv nyob rau hauv lub sij hawm geological. Vim feem ntau pob txha - bearing pob zeb tsim nyob rau hauv dej hiav txwv, qhov loj index fossils yog cov kab mob marine. Uas tau hais tias, qee yam tsiaj txhu hauv av yog pab tau hauv cov pob zeb hluas thiab cov cheeb tsam tshwj xeeb.
Tsis tas li ntawd, vim li cas thiaj tseem ceeb rau tib neeg los kawm txog pob txha? Peb lub tswv yim yog tseem ceeb hauv kawm thiab siv pob txha : (1) Fossils sawv cev qhov seem ntawm cov kab mob ib zaug nyob. (2) Feem ntau pob txha yog cov seem ntawm cov kab mob uas ploj lawm; uas yog, lawv yog cov tsiaj uas tsis nyob txhua qhov chaw hauv ntiaj teb.
Tsis tas li ntawd, peb tuaj yeem kawm dab tsi los ntawm index fossils?
Index fossils yog ntawm cov kab mob uas nyob thoob plaws cheeb tsam. Lawv nyob rau ib lub sij hawm luv luv. Ib index pob zeb tso cai rau tus kws tshawb fawb los txiav txim seb lub hnub nyoog ntawm lub pob zeb nws nyob hauv. Trilobite pob txha , raws li qhia hauv daim duab, yog feem ntau index fossils.
Dab tsi yog cov yam ntxwv ntawm qhov tseem ceeb index fossil?
A pab tau index fossil yuav tsum muaj qhov tshwj xeeb lossis pom tau yooj yim, muaj ntau, thiab muaj qhov dav ntawm thaj chaw faib khoom thiab ib qho luv luv los ntawm lub sijhawm. Index cov pob txha yog lub hauv paus rau kev txhais ciam teb nyob rau hauv lub sij hawm geological scale thiab rau correlation ntawm strata.
Pom zoo:
Dab tsi yog qhov txiaj ntsig tseem ceeb ntawm kev taw qhia ntawm tes los ntawm kev sib cuag lub cev ncaj qha?
Kev taw qhia kuj tshwm sim ntawm cov hlwb uas yog kev sib cuag ntawm lub cev. Kev sib cuam tshuam ntawm cov proteins ntawm qhov chaw ntawm cov hlwb tuaj yeem ua rau muaj kev hloov pauv hauv cov cwj pwm ntawm tes. Piv txwv li, cov proteins nyob rau saum npoo ntawm T-cells thiab antigen nthuav tawm cov hlwb sib cuam tshuam los ua kom muaj kev taw qhia hauv T-cells
Vim li cas qhov tseem ceeb ntawm qhov tseem ceeb?
Thaum koj pom tus nqi kiag li hauv qhov teeb meem lossis qhov sib npaug, nws txhais tau hais tias txhua yam nyob hauv tus nqi tiag tiag yog qhov zoo. Cov txiaj ntsig tsis zoo feem ntau siv rau hauv cov teeb meem cuam tshuam nrog kev nyob deb thiab qee zaum siv nrog qhov tsis sib xws. Qhov ntawd yog qhov tseem ceeb uas yuav tsum nco ntsoov nws zoo li qhov deb ntawm xoom
Ob qhov tseem ceeb ntawm lub voj voog ntawm tes yog dab tsi thiab dab tsi tshwm sim rau lub cell hauv txhua theem?
Muaj ob theem tseem ceeb hauv lub voj voog ntawm tes. Thawj theem yog interphase thaum lub cell loj hlob thiab replicates nws DNA. Qhov thib ob yog theem mitotic (M-Phase) thaum lub sijhawm cell faib thiab hloov ib daim qauv ntawm nws cov DNA mus rau ob lub hlwb zoo tib yam
Dab tsi yog 2 qhov tseem ceeb ntawm lub voj voog ntawm tes thiab dab tsi tshwm sim rau lub cell hauv txhua theem?
Cov xwm txheej no tuaj yeem muab faib ua ob qhov tseem ceeb: interphase (hauv nruab nrab ntawm kev sib faib theem ua pawg G1 theem, S theem, G2 theem), thaum lub xov tooj ntawm tes tsim thiab ua nrog nws cov haujlwm metabolic; mitotic theem (M mitosis), thaum lub sij hawm lub cell yog replicating nws tus kheej
Dab tsi yog qhov index fossil Dab tsi yog ob qhov yuav tsum tau ua ib qho index fossil?
Cov pob txha muaj txiaj ntsig zoo yuav tsum yog qhov sib txawv lossis pom tau yooj yim, muaj ntau, thiab muaj qhov dav ntawm thaj chaw faib khoom thiab muaj ntau yam luv luv los ntawm lub sijhawm. Index fossils yog lub hauv paus rau kev txhais cov ciam teb nyob rau hauv lub sij hawm geology thiab rau kev sib raug zoo ntawm strata