2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Placoid nplai tau pom hauv sharks thiab rays, thiab tuaj yeem sib txawv heev ntawm sab nraud. Tsis zoo li cov nplai ntawm cov ntses pob txha, cov nplai placoid tsis nce qhov loj me thaum cov ntses loj tuaj, hloov cov nplai tshiab ntxiv ntawm cov nplai laus.
Placoid nplai yog dab tsi?
Placoid scales (los yog denticles) yog spiny, toothlike projections pom tsuas yog nyob rau hauv cartilaginous ntses. Ganoid nplai, qee zaum suav tias yog kev hloov kho ntawm hom placoid, yog cov pob txha tseem ceeb tab sis tau them nrog cov khoom zoo li enamel hu ua ganoin.
Placoid nplai hauv zoology yog dab tsi?
placoid scale (dermal centicle) Ib hom nplai uas suav nrog chav hauv paus ntawm tawv tawv npog ntawm sharks. … Tsis zoo li cov nplai ntawm cov ntses pob txha, cov nplai placoid tsis loj hlob tom qab lawv ncav cuag qhov loj me thiab cov nplai tshiab tau ntxiv thaum tus tsiaj loj tuaj.
Placoid nplai loj npaum li cas?
placoid nplai ntawm sharks thiab rays yog qhia hauv daim duab 5a. Cov nplai no feem ntau yog me me (c. 100-200 lm ntev) thiab zaum saum cov pedestals uas loj hlob los ntawm anchors ntawm daim tawv nqaij (Motta li al.
Placoid nplai zoo li cas?
Placoid nplai yog cov nplai me me, tawv tawv uas npog daim tawv nqaij ntawm elasmobranches, lossis cov ntses cartilaginous - qhov no suav nrog sharks, rays, thiab lwm yam skates. Thaum cov nplais placoid zoo ib yam li qee txoj hauv kev rau cov nplai ntawm cov ntses pob txha, lawv zoo li cov hniav uas npog nrog tawv tawv.
Pom zoo:
Qhov khoom nyob rau pem hauv ntej ntawm lub lens diverging nyob qhov twg?
Teb: Dav hlau daim iav Dav Hlau Daim iav Rau lub teeb rays tawm lub dav hlau daim iav, lub lub kaum sab xis ntawm kev xav sib npaug ntawm lub kaum sab xis ntawm qhov xwm txheej. … Daim duab tsim los ntawm daim iav dav hlau yog ib txwm virtual (lub ntsiab lus tias lub teeb rays tsis yog los ntawm daim duab), upright, thiab ntawm tib lub duab thiab loj npaum li cov khoom nws yog reflecting.
Qhov chaw ncig tebchaws nyob hauv bhagalpur nyob qhov twg?
Bhagalpur faib lub zos yog ib pawg tswj hwm thaj chaw ntawm Bihar xeev ntawm Is Nrias teb, nrog Bhagalpur ua thawj coj hauv paus chaw haujlwm. Raws li xyoo 2005, qhov kev faib muaj xws li Bhagalpur koog tsev kawm ntawv, thiab Banka koog tsev kawm ntawv thiab nyob rau ntawm ntug dej ntawm Ganga River.
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.
