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Questions about the Quaternary era?

I'm preparing for a geology exam and have come across some study guide questions that I cannot find in my book. They are:

What are the major stages in the evolution of humans during the Quaternary era?

Why are deep-sea sediments so useful for Quaternary geochronology and paleonevironmental studies?

How is the lower boundary of the Quaternary Period defined, and what fossils are most useful for recognizing this boundary?

Any help you could give me with any of these questions would be greatly appreciated. Thank you!

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