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TherehasbeenlifeonEarthforaround3.5billionyears.Thefirstmicroscopicsingle-celledorganismsresidedintheworld’soceansandgraduallydevelopedintocomplex,multicellularorganisms,fromdinosaursinthebeginningtomammalsasweknowthemtoday.Thiswasaresultofevolution,whichisdrivenbynaturalselection:onlylivingthingsthatsuccessfullyadapttotheirenvironmentwillsurvive.