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Created with Fabric.js 1.4.5 The climates and geography of North andSouth America are opposite to what theywere in ancient times, thus causingopposite animals to exist now than inancient times such as the Tertiary Period.The same is true for the mammals of Indiaand Africa. They used to be switched. Darwin categorizes more recentforms of life ashigher than theancient forms because they hadsome advantage over the olderorganisms in order to survive,reproduce, and prosper, as isnatural selection DEFINITION: the branch of science concernedwith fossil animals and plants A massive part aboutPaleontology and the study ofextinction is natural selection. Paleontolog y Marsupials in Australia closely resemblethose of ancient times. This helps topromote the theory of DESCENT WITHMODIFICATION, meaning that new organismsare very similar in appearance and othercharacteristics, but are slightly modifiedto better fit the environment that the livein. Even though they no longerexist on Earth, the fossils ofextinct organisms help to fill inthe intervals between existinggenera, families, and orders. Natural Selection is defined asthe process wherebyorganisms better adapted totheir environment tend tosurvive and produce moreoffspring. The theory of itsaction was first fullyexpounded by Charles Darwinand is now believed to be themain process that brings aboutevolution. Under natural selection, newspecies become dominant andthey slowly but eventuallyspread to other areas wherethey are dominant. Thisprocess naturally occurs fasterfor marine organisms than forland organism, thereforecausing more of a parallel pfcharacteristics between marineorganisms than between landorganisms By theory of Natural Selection, all species have been connected with parent species of each genus. And every, now extinct, parent species have themselves been connected with their own parent organism. Geological records are filled with imperfections and can be less reliable, which explains how intermediatevarieties can be missing between species during eras like the paleozoic era (about 545-248.2 Ma). Paleontology shows that species migrate as environments evolve and climates fluctuate. For example, marine species can be found abundant in certain common deposits but extinct in surrounding seas, and vice versus.Migration and extinction occurs naturally as climatal and other changes occur. double click to changethis text! Drag a cornerto scale proportionally.
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