embryos是什么意思ryos在线翻译读音例句

一种罕见的化石记录

thepreservationofembryosandjuvenilesisarateoccurrencein

y,delicateskeletonsareusuallyscatteredbysca

os

aurshadahigherchanceofbeingpreservedthandidterrestrialcreatures

because,asmarineanimals,theytendedtoliveinenvironmentslesssubje

cttoerosion.

still,theirfossilizationrequiredasuiteoffactors:aslowrateof

decayofsofttissues,littlescavengingbyotheranimals,alackofswift

currentsandwavestojumbleandcarryawaysmallbones,andfairlyrapi

hesefactors,someareashavebecomeatreasuryofwell-

preservedichthyosaurfossils.

thedepositsatholzmaden,germany,presentaninterestingcasef

thyosaurremainsarefoundinblack,bituminousmarine

eyears,thousands

ofspecimensofmarinereptiles,fisha山坡羊潼关怀古ppt ndinvertebrateshavebeenrecovere

dfr水仙子 omtheserocks.

thequalityofpreservationisoutstanding,butwha李白送别诗 tisevenmore

impressiveisthenumberofichthyosaurfossilscontainingpreservedemb

osaurswithembryoshavebeenreportedfrom6differentlevel

softheshaleinasmallareaaroundholzmaden,suggestingthataspecifi

csitewasusedbylargenumbersofi山中杂诗吴均译文 chthyosaursre隙的拼音 peatedlyovertime.

theembryosarequiteadvancedintheirphysicaldevelopment;th

eirpaddles,forexample,cimenis元宵节的古诗两句 even

tion,theshalecontainstheremainsof

manynewbornsthatarebetween20and30incheslong.

whyaretheresomanypregnantfemalesandyoungatholzmade

nwhentheyaresorareelsewhere?thequalityofpreservationisalmost

unmatchedandquarryoperationshavebeencarriedoutcarefullywithan

sefactorsdon初二下册语文电子课本 otaccountfor

theinterestingquestionofhowtherecametobesuchaconcentrationof

pregnantichthyosaursinaparticularplaceveryclosetotheirtimeofgi

vingbirth.