Paleontologists have found fossils dating back 3.6 billion years. these closely resemble

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The Ediacaran biota were ancient lifeforms representing the earliest known complex multicellular organisms. They appeared soon after the Earth thawed from the Cryogenian period's extensive glaciersand largely disappeared soon before the rapid appearance of biodiversity known as the Cambrian explosionwhich saw the first appearance in the fossil record of the basic patterns and body-plans that would go on to form the basis of modern animals. Little of the diversity of the Ediacaran biota would be incorporated in this new scheme, with a distinct Cambrian biota arising and usurping the organisms that dominated the Ediacaran fossil record. All species of Psittacosaurus were gazelle -sized bipedal herbivores characterized by a high, powerful beak on the upper jaw.

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