[紧急]四十分钟在线等 英语生物题目

[紧急]四十分钟在线等 英语生物题目humans are thought to have evolved during the _eraa.cenozoic b.Mesozoicc.Paleozoicd.Precambriawhich group of organisms is believed to have been the earliest to evolvea.mammalsb.Cyanobacteriac.land plantsd.aquatic dinosaurswhich of the following fossils are not found in sedimentarya.amberb.imprintsc.petrified woodd.frozen mammothswhich of these is a period in the Mesozoic era?a Ordovicianb devonianc Jurassicd tertiarywhich period of geologic time was marked by an enormous increase in the diversity of life formsa the Permian periodb the Cambrianc the quaternaryd the Jurassicwhat type of rock are most fossils found ina sedimentaryb igneousc metamorphicd volcanicthe earliest organisms were most likely_a eukaryoticb prokaryoticc protobiontsd multicellularwhich of the following was probably not present in large amounts in the atmosphere at the time life is thought to have originateda waterb carbon monosidec oxygen gasd carbon dioxidewhat is the movement of genes into and out of a gene pool called?a Radom mating b gene flowc nonrandom matingd direct evolutionnatural processes such as speciation and gradualism provide the genetic basis for_a sexual reproductionb spontaneous generationc biogenesisd evolutionwhich of the following is not a factor that causes changes in the allelic frequencies of individuals in a populationa stabilizingb disruptive selectionc random selectiond directional selectionwhich of the following lines of evidence for evolution is indirecta fossilsb pesticide resistancec all of thesed observed allele frequency changes_is a machanism for change in a population of organismsa artificial selectionb natural selectionc analogous structuresd homologous structureswhich dating method relies on the position of rock layersa radiometricb relativec absoluted morphology本人在此跪求各位知识帝尽量快一些