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These animals saw most of the Phanerozoic Eon.
The Phanerozoic Eon is the most recent eon that started 540 million years ago and extends to even today. This eon is made of three different eras. What are the three eras? Discribe them.
Life became more and more diverse in the Phanerozoic Eon. What were the most recent organisms from each era?
Climate has changed many times during the Phanerozoic Eon. What was the climate like at the very beggining of it?