Video: Dab tsi tshwm sim hauv Miocene Epoch?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov Miocene Epoch , 23.03 txog 5.3 lab xyoo dhau los, * yog lub sijhawm huab cua sov thoob ntiaj teb dua li cov hauv ntej Oligocene los yog Pliocene hauv qab no thiab nws tseem ceeb heev nyob rau hauv uas ob lub ecosystems loj tau tshwm sim thawj zaug: kelp forests thiab grasslands.
Hais txog qhov no, dab tsi tshwm sim hauv Pliocene lub sijhawm?
Thaum lub sij hawm Pliocene Epoch , kwv yees li 5.3 txog 2.6 lab xyoo dhau los, cov teb chaws tau tsiv mus nyob ib puag ncig ntau. Qhov no tau tsim ntau lub roob thiab koom nrog North America thiab South America ua ke los ntawm Isthmus ntawm Panama. Muaj cov nyom qhuav thiab ntau cov tsiaj qus uas vam meej, thaum lwm hom tsiaj tuag.
Tom qab ntawd, lo lus nug yog, Miocene xaus li cas? 5.333 lab xyoo dhau los
Tsis tas li ntawd, cov tsiaj twg nyob hauv lub sijhawm Miocene?
Thaum lub sij hawm tom qab Miocene cov tsiaj txhu niaj hnub no, nrog rau cov canids pom tau yooj yim, dais, procyonids, equids, beavers, mos lwj, camelids, thiab whales , nrog rau tam sim no cov pawg uas ploj lawm zoo li borophagine canids, qee yam gomphotheres, peb-toed nees, thiab semiaquatic thiab hornless rhinos zoo li Teleoceras thiab Aphelops.
Miocene tau ntev npaum li cas?
23.03 lab xyoo dhau los - 5.333 lab xyoo dhau los
Pom zoo:
Qhov twg tshwm sim thawj lub teeb nyob ntawm qhov tshwm sim lossis lub teeb ywj pheej?
Lub Teeb-Dependent thiab Lub Teeb-Independent Reactions. Cov tshuaj tiv thaiv lub teeb, lossis cov tshuaj tiv thaiv lub teeb-dependent, yog thawj zaug. Peb hu lawv ob leeg thiab ob lub npe. Nyob rau hauv lub teeb-dependent tshwm sim ntawm photosynthesis, lub zog ntawm lub teeb propels lub electrons los ntawm ib tug photosystem mus rau lub high-zog lub xeev
S sawv rau dab tsi thiab dab tsi tshwm sim hauv theem no?
S theem sawv rau 'Synthesis'. Qhov no yog theem thaum DNA replication tshwm sim. The G2 stage stands for 'GAP 2'
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
Cov kauj ruam ntawm mitosis yog dab tsi thiab dab tsi tshwm sim hauv txhua qhov?
Mitosis muaj tsib theem sib txawv: interphase, prophase, metaphase, anaphase thiab telophase. Cov txheej txheem ntawm cell faib tsuas yog ua tiav tom qab cytokinesis, uas tshwm sim thaum lub sij hawm anaphase thiab telophase. Txhua theem ntawm mitosis yog tsim nyog rau cell replication thiab faib
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