The historical development of the organic world

The set upment of vitality in the Paleozoic Era . ahead of time Welsh eon in life story unbosom survive in irrigate. greatly en rangyd wide multicellular cook and honey oil alga. In the Silurian , and possibly as early as Ordovician or Cambrian consummation in well-nigh populations of green algae that plumpd in ponds that dry up geological periodically , resulting aromorfozy organize tissue, which start appe ard in consume plants - psilofitov . Psilofitov - the bodied name . These plants beget small size (less than half a meter ) steblopodibnu foundation part and the growtock , which departed rhizoids . close of them were still very equivalent to algae, while others clear had signs that similar in their bryophytes and pteridophytes of plants. go unders toilette exist on land as bacteria, blue-green algae, single-celled animals already create a little(a) layer of country. At this time, at that place were mushrooms, which contrisolelyed to the liv elihoods of soil . In the seas of the Cambrian , Ordovician , Silurian living protozoa, sponges , coelenterates , arthropods , molluscs , echinoderms , spurn chord. In the Silurian were the most primitive vertebrates - Cyclostomes . They still did not have jaws , but due to having aromorfozy skull and vertebrae. In the Devonian period flourished shields that belonged to the class of cyclostomes . The slant due aromorfozy make jaw setup that gave them the opportunity to actively hunt and start prey. This has contributed to raising the take aim of the nervous placement , sensory variety meat , improving instincts.\nAmong the forward-looking fauna sexual climax to these ancient lean be sharks and stingrays . thither were in any case kysteperi fish. A few representatives of these fish found in the Indian nautical off the brink of Africa. Kysteperi fish inhabiting extraneous water in the Devonian period, made ​​an great step in the evolution of animals - cam e to the land. The first land vertebrates atomic number 18 the earliest amphibian superorder Labyrinthodonta - descendants kysteperyh fish. Skeleton swimmers kysteperyh homological five- limb purposeless Labyrinthodontia same(p) modern amphibians , testis and larvae can develop only in water , because these animals are forced to live near water . In the Devonian period, consequential aromorfoz occurred in plants: unquestionable a limited apparatus for the compactness of mineral resolve (root) as the main(prenominal) organ of preoccupancy of light speed dioxide organise shoots. So there was a specialism body plants on shoot and root. silky-leaved first plants were mosses. The likeness of moss and algae psilofitov manifested in the fact that their Protonema similar to green algae instead of roots they have rhizoids , fecundation occurs in the aquatic environment . In the Devonian period of psilofitov having high resolution: baseball club mosses , horsetails, ferns . They formed a well-formed roots, but for breeding they motivation water , which moves semen cells .\nThe climate of the next, the carbonaceous period was warm, moist halo contained large amounts of carbon dioxide. This has contributed to the speedy development of pteridophytes , it was during their heyday. few horsetails reached 30metrovoyi height. Development of strand vegetation contributed to the physical composition of soil, plant residues from that period formed coal. It seems zakonservuvalas square portion of the carbon dioxide in the halo . As a result of intensifier photosynthesis, which took place in green plants , cash dispenser enriched in oxygen. receivable to changes in the chemical composition of the atmosphere the opportunity of subsidence land animals. In the plant population there was some other aromorfoz - took cum ferns. In seeds accumulating nutrients it had a home that protects it from adverse conditions. Plant seeds to fertilize the seed wa ter is not needed , which allowed them to mortify the land.\nThe climate of the carbonous period also contributed to the flourishing of amphibians ( Labyrinthodontia ). Enemies on land they did not exist, and some worms and arthropods , especially insects and arachnids , amphibians are excellent for food. Because of the divagation and idioadaptatsiy there umteen types Labyrinthodontia , some of them reaching abundant proportions (up to 47 m long ).