2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Lub tswv yim ntawm pteridosperms rov qab mus rau kawg xyoo pua 19 thaum palaeobotanists tuaj paub tias ntau cov Carboniferous fossils zoo li fern fronds muaj anatomical nta ntau reminiscent ntawm niaj hnub cov noob nroj tsuag., cov cycads.
Pteridosperms tau ploj mus thaum twg?
Qee yam ntawm cov noob qoob loo qub tshaj plaws yog rau pteridosperms. Thaum lub sij hawm Carboniferous thiab Permian, noob ferns yog ib qho tseem ceeb ntawm cov nroj tsuag. Thaum lub sij hawm Mesozoic, txawm li cas los xij, lawv cov lej tau poob qis thiab kawg ntawm Cretaceous feem ntau pteridosperms tau ploj mus.
Thaum twg cov noob ferns tshwm sim?
Cov fossil cog Elkinsia polymorpha, "cov noob fern" los ntawm lub sijhawm Devonian-kwv yees li 400 lab xyoo dhau los-yog suav tias yog cov noob qoob loo ntxov tshaj plaws paub txog hnub no.
Yuav ua li cas cog noob qoob loo thaum ub?
Cov noob qoob loo qub tshaj plaws yog Elkinsia polymorpha, "cov noob fern" los ntawm Late Devonian (Famennian) ntawm West Virginia. Txawm hais tias cov fossils tsuas muaj cov noob me me xwb, cov kab no tau khaws cia zoo heev.
thawj cov noob qoob loo yog dab tsi?
Seed ferns yog thawj cov noob nroj tsuag, tiv thaiv lawv qhov chaw yug me nyuam hauv cov qauv hu ua cupules. Cov noob ferns tau nce mus rau lub gymnosperms thaum lub sijhawm Paleozoic Era, txog 390 lab xyoo dhau los.
Pom zoo:
Thaum twg denny duquette tshwm sim thawj zaug?
First see: Season two, Episode 13. Denny Duquette yog tus neeg mob ntev ntawm Preston's. Nws flirted nrog Izzie tom qab qhia mus rau Seattle Grace Tsev Kho Mob rau kev hloov lub plawv. Denny tuaj rau Greys lub caij twg? 10 Pib Pib - 2x13.
Thaum twg arachnids tshwm sim thawj zaug?
Cov ntaub ntawv ntxov tshaj plaws uas pom tau tias yog arachnids suav nrog scorpion uas hnub los ntawm Silurian Sijhawm (txog 443.7 txog 416 lab xyoo dhau los) thiab acarid los ntawm Lub Sijhawm Devonian (416 txog 359.2 lab xyoo dhau los). arachnids hloov zuj zus los ntawm qhov twg?
Thaum twg choanoflagellates tshwm sim thawj zaug?
Thawj qhov qhia txog kev sib raug zoo ntawm choanoflagellates thiab Metazoa tshwm sim thaum nruab nrab mus rau lig- 1800s thaum cov kws tshuaj ntsuam xyuas tau sau tseg qhov zoo ib yam ntawm choanoflagellates rau lub dab tshos (los yog ' choanocytes') ntawm daim txhuam cev.
Thaum twg postcolonialism thawj zaug tshwm sim?
Postcolonial txoj kev xav tau tshwm sim hauv Asmeskas thiab UK cov kev kawm hauv xyoo 1980sua ib feem ntawm cov nthwv dej loj dua ntawm cov tshiab thiab kev nom kev tswv ntawm tib neeg kev tshawb nrhiav, tshwj xeeb tshaj yog poj niam thiab haiv neeg txoj kev xav.
Thaum twg tus neeg raug tsim txom tshwm sim thawj zaug?
Victimology thawj zaug tshwm sim hauv the 1940s thiab '50s, thaum ntau tus kws kho mob txhaum cai (tshwj xeeb yog Hans von Hentig, Benjamin Mendelsohn, thiab Henri Ellenberger) tshuaj xyuas cov neeg raug tsim txom-neeg ua txhaum kev sib cuam tshuam thiab kev cuam tshuam kev cuam tshuam.
