New Evolutionary Timetable

adaptive radiation ancestors appear Australopithecus africanus believed biological biologists brain branches breeding Cambrian Cenozoic century chapter chromosomal chronospecies cichlid concept continent creation creationists cultural Cuvier descended dinosaurs distinctive divergence Dobzhansky early Earth established species evolutionary change evolutionists evolved example extinction fact faunas FIGURE fishes fossil data fossil evidence fossil record Galápagos genera genes genetic genus geological gradual gradualistic groups hominid Homo erectus Homo sapiens human evolution Huxley Ice Age idea individuals inheritance interval islands kind Lake Victoria lineage living fossils Lyell mammals million years ago million years old Modern Synthesis mutation natural selection Neanderthal Origin of Species paleontology particular pattern plenitude Precambrian predators punctuational model punctuational view quantum speciation rapid rapidly recognized represent resemble rocks simple single species slender australopithecine small populations snail speciation speciation events species selection structures survive tion traits transformation tree trend variability variation well-established species