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accordingly adaptation affirm America ancestral angiospermous answer argument Asilidae Australia basic believe biogeographic biology birds botanist botany Cape carpel casual means concepts conclusion course Darwin Darwinian definitely discussion Eastern Empetraceae endemic enquiry environment Ericaceae essential Euphorbiaceae eventually evidence evolution evolutionism example fact factual feather finally flora flower follows form-making Galapagos Gavin de Beer genera genus geographic distribution geological Gossypium groups Gryphaea islands kind law of growth least less lines Machairodontinae macroevolution Madagascar main text matter Menodora Mexico migrations morphogeny morphology mutation natural selection naturalist Oenothera Origin of Species orthogenetic orthogeny orthoselection ovary Panbiog particular Pedilanthus phytogeography Princ question range reader reason reference sector sense Simpson South Africa southern South Africa stand standard strobile structural subspecies sure taxonomic Tenasserim tendency theory thinking track translation in space true understanding vicariism Western whole