2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Fossils yog tsim nyob rau hauv ntau txoj kev, tab sis feem ntau yog tsim thaum ib tsob nroj los yog tsiaj tuag nyob rau hauv ib tug watery ib puag ncig thiab faus rau hauv av nkos thiab silt. Cov ntaub so ntswg sai sai decompose tawm hauv cov pob txha tawv los yog plhaub tom qab. Sij hawm dhau mus sediment ua rau saum toj thiab hardens rau hauv pob zeb.
Cov pob txha loj tshaj plaws nyob qhov twg?
Fossils feem ntau pom nyob qhov twg cov pob zeb sedimentary ntawm lub hnub nyoog raug - uas rau dinosaurs yog Mesozoic - raug nthuav tawm. Qhov chaw zoo tshaj yog kwj hav dej, pob tsuas thiab hillsides, thiab tib neeg tsim tawm xws li quarries thiab kev txiav.
3 txoj kev pob txha yog dab tsi?
Qhov muaj feem yuav ua pob txha pob txha yog txhim kho los ntawm kev faus neeg sai thiab muaj qhov ruaj khov, xws li pob txha lossis plhaub. Fossils tsim nyob rau hauv tsib txoj kev: preservation ntawm qub seem, permineralization, pwm thiab casts, hloov, thiab compression.
pob txha pob txha nyob qhov twg?
Fossils pom yuav luag tshwj xeeb hauv pob zeb sedimentary -pob zeb uas tsim thaum xuab zeb, silt, av nkos, thiab cov khoom organic tawm hauv dej los yog huab cua los ua cov txheej txheem uas tom qab ntawd compacted. mus rau pob zeb.
7 hom pob txha yog dab tsi?
Txhua yam ntawm lawv sib txawv…
- Petrified fossils: …
- Moulds fossils: …
- Casts fossils: …
- Carbon films: …
- Preserved seem:
- Trace fossils:
Pom zoo:
Fossils tsim ib kauj ruam li cas?
Theem 1: Ib tug dinosaur tuag thiab faus ua ntej cov seem yuav raug puas tsuaj tag. Kauj Ruam 2: Thaum lub sij hawm dhau mus, txheej ntawm cov av khib nyiab tsim thiab nias rau ntawm qhov faus seem. Theem 3: Dissolved minerals, thauj los ntawm av-dej nyob rau hauv cov sediment, sau me me qhov chaw nyob rau hauv cov pob txha.
Kev tsis ncaj ncees nyob qhov twg yog qhov hem rau kev ncaj ncees nyob txhua qhov chaw?
Martin Luther King tau hais tias: “Kev tsis ncaj ncees nyob txhua qhov chaw yog kev hem thawj rau kev ncaj ncees nyob txhua qhov chaw. Peb raug ntes nyob rau hauv ib tug inescapable network ntawm kev sib nrig sib pab, khi nyob rau hauv ib lub tsoos tsho ntawm txoj hmoo.
Qhov twg yog qhov tsis txaus ntseeg nyob qhov twg?
Yuav muaj ob lub cev tsis zoo nyob rau hauv lub midbrain. Lawv yog symmetrically positioned, ib tug nyob rau ntawm ob sab ntawm lub midline ntawm lub hlwb, thiab lawv tsim ob lub pob nyob rau hauv lub posterior nto ntawm lub paj hlwb nyob rau hauv qab ntawm lub superior colliculi.
Qhov twg tag nrho cov nqi hluav taws xob nyob ntawm qhov kev siv nyiaj siab tshaj plaws yog qhov twg?
marginal utility is zero. Tag nrho cov nqi hluav taws xob yog siab tshaj thaum marginal utility yog xoom. Qhov no yog vim muaj ntau txoj cai ntawm kev txo qis marginal utility uas hais tias tus neeg siv khoom noj ntau thiab ntau qhov zoo, qhov ntxiv rau tag nrho cov nqi hluav taws xob poob.
Qhov twg yog qhov tsim qauv tsim?
Hauv software engineering, tsim qauv tsim yog qauv tsim uas cuam tshuam nrog cov khoom tsim cov txheej txheem, sim tsim cov khoom kom haum rau qhov xwm txheej. … Cov qauv tsim tsim yog tsim los ntawm ob lub tswv yim tseem ceeb. Ib qho yog encapsulating kev paub txog qhov twg cov chav kawm ua vaj tse siv.
