Simplest life form - Algae and Bacteria, Most complex life forms - Humans & Wolly Mammoth, Geological Time Scale - A chart that organizes Earth's 4.6 billion year old history., Fossil - The remains or traces of plants and animals that live a long time ago., Extinction - The dying out or disappearance of a species from earth, Climate - The weather conditions over a long period of time, Environment - The surroundings or conditions in which a person, animal or plant lives,

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