Making North America: Life剧情介绍

NorthAmerica'sgeologicalhistoryanswerssomecuriousriddlesaboutlifeonthecontinent.WhyweretheresomanydinosaurspeciesinwesternNorthAmerica?WhyweretherefishinKansasandshellfishintheRockies?WhathappenedtothenumerousNorthAmericanlemurspecies?