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The Infinite Variety
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able Africa America ancestors animals appear bats became become begin beneath birds body bones branches called carry cells close colours contain continuous covered creatures deposits developed dinosaurs early effective eggs entirely eventually existence extremely eyes feathers feed female fins fish flowers flying forest fossils front give ground grow hands head huge hundred hunting individual insects jaws keep kind land larvae later leaves legs light living look male mammals metres million million years ago monkeys mouth move nest once organisms pair particularly pass period placenta plants pouch prey produce pupa reach remains reptiles river rocks running scales seems shape shell side simple skin snake sometimes sound South species surface swim tail teeth thousand tiny trees turn walls whole wings worms young