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When did the universe begin with the big bang?
13.7 billion years ago
When did our solar system begin?
4.6 billion years ago
How old is the Earth?
4.55 billion years old
When did the Earth cool enough for oceans to form?
4 billion years ago
When did life emerge?
between 3.5 to 4 billion years ago
What do you need before you can have a living cell?
polymers, information transfer, membrane, and cellular properties
What did the Paleozoic era start with?
The Cambrian Explosion
What is the current eon?
The Paleozoic Eon
What is the current era?
Cenozoic era
What is our current period?
Quaternary Period
Note 
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