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able adapted Africa allele angiosperms animals and plants Arctic areas Asia Australia become biogeography biome birds blue chaffinch Britain Cenozoic cent Chalkhill blue Chthamalus climatic changes colonization common competition continental continental drift continents cycads deciduous desert dispersal diversity early ecological niches ecosystem efficiency endemic energy environment Europe evolution evolutionary evolved example extinction factors fauna feed Figure flora floral regions flowering plants fossil genera geographical glaciation Gondwanaland gradient gradually grasses grassland grazing groups habitat Hawaiian herbivores Ice Ages insects island isolated lakes land larvae Late Cretaceous latitudes limited live mainland mammals marsupials microhabitats mountain North America Northern Hemisphere number of species occupied ocean organisms patterns of distribution plant species plants and animals Pleistocene pollen population predators probably production range result season seeds soil South southern species spread survive temperate temperature terrestrial tion trees trophic levels tropical types vegetation woodland