Three strategies a student should use in researching are

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Get organized, make sure u have a general idea of wut ur looking for and wut ur researching also make sure u have a form of data containemnt so u can take notes 

Identify your information needsm find out wut it is ur looking for exactly for example say im looking up research about wolves. u would need to find out wut u are wantign to know about wolves

List keywords and concepts for possible search websites, once u find out wut ur researching and wut ur looking for to be answered u can find out wut website u might end up using there fore making the search easier

Yes you are cute answer theories to explain the colonization of the new world the last great habitable landmass to be occupied by humans focus on the bering land bridge, or beringia, which emerge by siberia and alaska the last ice age.