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How Prehistoric Life ls Revealed
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3.5 billion 542 million Accessed October ancestor Anomalocaris appendages Archaea archaebacteria arthropods asteroid Available online Aysheaia background extinction bacteria biological adaptation birds body bones Burgess Shale Cambrian Period Canadaspis carbon caused cells changes Chengjiang chordates cladistics classification continued core creatures dating deposit feeders dinosaurs domain Early Cambrian Earth Earth’s crust environment Epoch evidence evolution evolutionary evolved explored fossil record genetic geologic geologic timescale geologists groups habitat Hallucigenia humans Hutton inﬂuenced Infobase Publishing kinds kingdoms land layers legs life-forms living organisms living things lnfobase mammals mantle mass extinction million years ago minerals molecular molecules natural selection ocean offspring Onychophora outer oxygen paleontologists percent phyla phylum Pikaia plants and animals Precambrian predators prehistoric reproduce scientists seaﬂoor sediment sedimentary rock Sirius Passet species specimens structure survive tectonic plates timescale tion today’s trilobites velvet worms Vendian Vendian fauna vertebrates Wegener worms