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Choanoflagellates first appeared 600 MYA. Ctenophora first appeared 515 MYA. That is the timespan of this timeline, although the program does not allow for these dates to be entered.
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Sponges
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A list shows items. A timeline shows sequence.
Use Timetoast to make dates, milestones, and turning points easier to understand in a clear visual format. Timetoast is a timeline maker for work, school, research, and stories.