Which eon spans roughly 2.5 billion to 540 million years ago and includes the evolution of multicellular organisms and the atmosphere beginning to fill with oxygen?

Study for the Praxis Elementary Education: Three-Subject Bundle – Science (5905) Test. Access flashcards and multiple choice questions with hints and explanations to prepare effectively for your science exam!

Multiple Choice

Which eon spans roughly 2.5 billion to 540 million years ago and includes the evolution of multicellular organisms and the atmosphere beginning to fill with oxygen?

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