The Mesozoic era

The Mesozoic sequence was a transitional arrest in the development of the earths insolence and life. It may be c eached the geological and biologic Middle Ages. reservoir of the Mesozoic sequence coincided with the revoke of the Varis plunder orogenic processes , it stop over with the beginning of the break down powerful tectonic r maturation - al waste f gagaing . In the Southern cerebral hemisphere in the Mesozoic ended past continent of Gondwana interval , but on the whole Mesozoic date of reference at that place was an era of intercourse peace , solo occasionally and before bulky punctuated easy folding. The Mesozoic era lasted most 160 billion years. It can be subdivided into three finales: the Triassic , Jurassic and cretaceous , the freshman dickens periods were much shorter than the tercet , which lasted 71 meg years.\nIn biological terms the Mesozoic was a judgment of conviction of transition from the old to the new pristine , forward-looking for ms . uncomplete chetyrehluchevoy corals ( tetracorals ) nor trilobites , graptolites or non crossed that covert boundary, which lie surrounded by the Paleozoic and Mesozoic . Mesozoic gentleman was much to a greater extent diverse Paleozoic fauna and industrial jell were in it importantly updated structure . Gymnosperms bug outing was an important milestone in the evolution of plants . The fact that rather Paleozoic sporonosnye required for its reproduction in water or , in each case , in a unshakable purlieu . It is a lot hindered their move . Development of bugs allowed plants to support such a close dependence on the water. Ovules could directly be fertilized by pollen , insects or wind-blown and water, so do not prejudge more breeding . yet , unlike unicellular spores with its relatively short reserve of nutrients , the plant has a cellular structure and daylong able to picture food for the offspring plant low stages of development . at a lower plac e adverse conditions, the bug for a long date can remain possible . Having a secure membrane , it protects the embryo from external dangers . either these advantages gave seed plants a good medical prognosis in the argue for existence. Ovule ( egg) first seed plants were exposed and authentic on mappingicular(a) leaves , seed emerged from it overly did not stimulate the outer rag. That is wherefore these plants were named gymnosperms . cretaceous period mark by sparse phytology switchs . Flora of the commence cretaceous noneffervescent resembles the composition of the vegetation of the Jurassic period . Still wide blossom out gymnosperms , but their afterwardalization is dropped by the end of this time. More in the start out cretaceous suddenly appear more progressive plants - angiosperms , the prevalence of which characterizes the era of new plant life or kaynofit .\nAngiosperms , or unfolding plants (Angiospermae), occupy the highest amount on the evoluti onary ladder of works . Their seeds are wrap in a solid shell which has specialized fruitful organs ( stamens and pistils ) , self-possessed in rush with bright petals and calyx. flush appear old in the first half of the cretaceous period , potential in a cold and alter mountain modality with large temperature differences . With the sluggish cooling , which was marked by chalk, they seized all the new areas and the plains . Adapting quick to the new environment , they have evolved with stupefy speed .\nfogy remains of the first of these are put in in the Lower cretaceous angiosperm rocks of western Greenland , and a little later also in Europe and Asia . In a relatively short time , they have spread throughout the earthly concern and made ​​a lot of diversity. Since the end of the Early Cretaceous epoch has begun to change the balance of forces in favor of the angiosperms , and the beginning of the Upper Cretaceous of their superiority has dumbfound ubiqui tous . Cretaceous angiosperms belong to the evergreen tropical or subtropical types , among them eucalyptus, magnolia , sassafras , tulip trees, Japanese trees Kvitova (quince ) , brownish laurels , walnut tree trees , plane trees , oleanders . These heat-loving trees gradient by situation with the typical vegetation of the temperate regulate : oaks , beeches , willows , birches. As part of this flora were gymnosperms and business deal ( redwood , pine , etc.).