Hais lus nruj me ntsis, metamorphosis yog ib qho kev hloov pauv, kev hloov pauv uas tshwm sim hauv lub Ntiaj Teb. Lo lus no yog qhov dav dav thiab siv ntau yam kev paub txog kev tshawb fawb. Hauv tsab xov xwm no peb yuav xav txog lub tswv yim los ntawm qhov pom ntawm biology. Nyob rau hauv lub moj khaum ntawm kev tshawb fawb ntawm lub neej, nws yog qhov tseeb dua los hu qhov tshwm sim "metamorphosis", nyob rau hauv cov txiv neej poj niam, ntxiv ob qho kev xaiv yuav raug siv.
Yog li, hauv biology, metamorphosis yog qhov kev hloov pauv ntawm cov kab mob hauv lub cev, uas yuav tsum tshwm sim thaum nws ontogenesis. Qhov tshwm sim yog pom nyob rau hauv cov nroj tsuag thiab tsiaj txhu. Nyob rau hauv tas li ntawd, metamorphosis tshwm sim nyob rau hauv lub neej voj voog ntawm feem ntau invertebrates thiab ib co vertebrates: cyclostomes, ntses, thiab amphibians. Lub ntsiab lus ntawm cov txheej txheem yog nyob rau hauv kev hloov pauv ntawm cov kab mob larval (hauv cov tsiaj) lossis qee yam kabmob (hauv cov nroj tsuag) raws li txoj hauv kev uas cov neeg laus tsim cov kab mob tshwm sim vim qhov sib txawv ntawm cov menyuam yug tshiab hauv cov qauv, lub cev thiab kev ua haujlwm tseem ceeb.
Rau tsiaj, metamorphosis tsis yog ib qho kev hloov pauv ntawm lub cev xwb. Qhov tshwm sim yog nrog los ntawm kev hloov ntawm qhov chaw nyob thiab tej yam kev mobmuaj nyob. Lub luag haujlwm tseem ceeb ntawm tus neeg laus kab mob yog txawv kiag li ntawm cov theem larval, qhov sib txawv ntawm qhov chaw nyob, cov khoom noj, thiab ntau lwm yam ntsiab lus. Yog li, peb pom qhov tseem ceeb ntawm metamorphosis hauv qhov xwm txheej, nws ua kom txo qis kev sib tw lom neeg rau zaub mov, chaw nyob thiab lwm yam ntawm cov kab mob ntawm ntau tiam neeg ntawm tib hom.
Cia peb saib ze dua ntawm metamorphosis hauv cov tsiaj. Tej zaum qhov piv txwv zoo tshaj plaws yuav yog chav kawm ntawm kab. Metamorphosis yog tus yam ntxwv ntawm txhua tus neeg sawv cev ntawm pab pawg no. Cov txheej txheem yog ua tiav kev hloov pauv lossis tsis tiav. Ua kom tiav metamorphosis cuam tshuam txog peb theem ntawm kev loj hlob ntawm cov kab mob: kab mob xws li kab mob larva, pupa (theem immobile, thaum lub sij hawm lub cev ntawm tus larva yog kiag li puas thiab ib tug tshiab lub cev ntawm ib tug neeg laus yog tsim) thiab ib tug neeg laus kab. Qhov tshwm sim no yog ib qho zoo rau Diptera (yoov tshaj cum), Hymenoptera (bees, bumblebees, wasps), Lepidoptera (butterflies), Coleoptera (ladybugs). Nrog tsis tiav metamorphosis, tsuas yog ob theem ntawm txoj kev loj hlob yog pom: ib tug larva, morphologically zoo li ib tug neeg laus, thiab, qhov tseeb, ib tug neeg laus kab. Kev hloov pauv tsis tiav yog cov yam ntxwv ntawm orthoptera (locusts, grasshoppers, bears), homoptera (aphids) thiab hemipterans (kab laum).
Rau cov nroj tsuag siab dua, metamorphosis yog kev hloov kho ntawm tib neeg lub cev nrog rau lawv txoj haujlwm, thiab tsis yog kev hloov pauv ntawm tag nrho lub cev. Raws li txoj cai, rudimentary es tsis yog tag nrho tsim cov kabmob nkag mus rau hauv cov txheej txheem. Cog metamorphoses kujhu ua kev hloov kho. Cov no yog, piv txwv li, qhov muag teev (rau dos), pos (rau cactus), antennae (rau txiv hmab), rhizome (rau qhiav), tubers (rau qos yaj ywm) thiab ntau ntxiv. Qhov tseem ceeb ntawm metamorphosis rau cov nroj tsuag yog nyob rau hauv lawv adaptation rau ib puag ncig tej yam kev mob. Yog li, piv txwv li, pos (hloov nplooj), pom nyob rau hauv cov nroj tsuag nyob rau hauv cov huab cua kub, los ntawm lawv cov duab pab txo evaporation ntawm nplooj nplooj.
