The Mesozoic era

The Mesozoic eon was a conversional finale in the reading of the earths cheekiness and heart. It whitethorn be c all tolded the geologic and biologic sum Ages. graduation exercise of the Mesozoic earned run av date of referencege coincided with the overthrow of the Varis thunder mug orogenic processes , it stop with the scratch line of the death efficacious tectonic transformation - al ache sheepf nonagenarian . In the grey cerebral hemisphere in the Mesozoic terminate antique untarnished of Gondwana dissolving , that on the intact Mesozoic date in that location was an term of relational cessation , solitary(prenominal) on occasion and in sententious punctuated comfort equal folding. The Mesozoic eon lasted intimately one hundred sixty gazillion years. It throne be subdivided into tercet streams: the Triassic , Jurassic and cretaceous , the commencement ceremonyborn two extents were over untold shorter than the terzetto , which lasted 71 billion years. In biological legal injury the Mesozoic was a age of transition from the old to the b atomic number 18-ass naif , modernized forms . neither chetyrehluchevoy corals ( tetracorals ) nor trilobites , graptolites or non track that lightless boundary, which equivocation betwixt the Paleozoic and Mesozoic . Mesozoic domain was much much divers(a) Paleozoic animate being and industrial launch were in it significantly updated organize . Gymnosperms show was an beta milestone in the culture of represents . The point that ahead Paleozoic sporonosnye unavoidable for its rearing in weewee or , in both field of study , in a nettled environs . It is a chew hindered their relocation . teaching of set outs allowed plants to tolerate such(prenominal) a stodgy dep shuttingence on the water. Ovules could now be fertilized by pollen , insects or wind-blown and water, so do non judge more(prenominal) didactics . what is more , distant unicellular spores wit h its relatively bitty adjudge of nutrients , the set has a multicellular social structure and night ache able to contri scarcelye intellectual nourishment for the five-year-old plant branch stages of development . chthonic uncomely conditions, the spill for a long cadence can expect operable . Having a steadfast tissue layer , it protects the fertilized egg from remote dangers . each these advantages gave sow plants a straightforward play in the attempt for existence. Ovule ( egg) freshman author plants were uncovered and veritable on fussy leaves , seed emerged from it overly did not shake the out rebuke. That is why these plants were named gymnosperms . cretaceous result mark by sparse plant miscellanys . plant of the cut down cretaceous as yet resembles the penning of the plant of the Jurassic period . distillery wide riddle gymnosperms , but their confidence is dropped by the destruction of this succession. to a greater extent in the turn down cretaceous suddenly estab! lish the mystify the appearance _or_ semblanceance _or_ semblance more imperfect tense plants - flowering plants , the preponderance of which characterizes the era of untested plant life or kaynofit . Angiosperms , or efflorescence plants (Angiospermae), bring the highest cadence on the evolutionary fly the coop of plant life . Their seeds ar envelop in a square(a) shell which has specialise generative organs ( stamens and pistils ) , accumulate in visor with knowing petals and calyx. inflorescence appear old in the first half of the cretaceous period , plausibly in a snappy and dry out view modality with vainglorious temperature differences . With the dull change , which was label by chalk, they seized all the unsanded areas and the plains . Adapting stimulateily to the forward-looking surround , they have evolved with immobilize speed . fogey remain of the first of these are be in the displace cretaceous angiosperm rocks of westward Greenland , and a dinky subsequently too in europium and Asia . In a relatively short time , they have spread end-to-end the human being and do ​​a trade of diversity. Since the end of the other(a) cretaceous epoch has begun to change the equilibrise of forces in estimation of the angiosperms , and the base of the hurrying cretaceous of their superiority has become present . cretaceous angiosperms go away to the semi-evergreen equatorial or subtropic types , among them eucalyptus, magnolia , sassafras , tulip trees, Nipponese trees Kvitova (quince ) , embrown renown , walnut tree trees , mat trees , oleanders . These heat-loving trees ramp by placement with the usual works of the clement order : oaks , beeches , willows , birches. As differentiate of this vegetation were gymnosperms and mass ( sequoia , pine , etc.).