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The Infinite Variety
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Africa amphibians ancestors ancient animals ant-eater appear Archaeopteryx Australia bats become beetles beneath birds body bones branches burrowing cells centimetres chitin claws coelacanth colony colours coral creatures cycads deposits descendants developed dinosaurs eggs eventually eyes feathers feed female fertilised fins fish flatworms flowers flying forest fossils frogs front ground grow hatch head hind horseshoe crabs huge hundred hunting insects invertebrates jaws jellyfish kind lancelet land larvae leaves legs lemurs living lizards lungfish male mammals marine iguanas marsupial mate membrane metres million years ago millipedes molluscs monkeys mouth move muscles nest numbers organisms oxygen pair plants platypus pollen pouch prey primitive produce prosimians reef remains reptiles river rocks sand sea floor segmented shape shell side skeleton skin snake South America species sperm surface survive swim tail teeth temperature tentacles termites tiny trees trilobites tube twigs whales wings worms young