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A Demonstrate the first three eras and the periods they contain on a scaled time line. b U

A Demonstrate the first three eras and the periods they contain on a scaled time line. b U

A Demonstrate the first three eras and the periods they contain on a scaled time line. b Use arrows to indicate the reign of the dinosaurs and when humans appeared. c Explain why would it be difficult to extend the time line to include the Precambrian era.
 
Abhinav 28-Nov-2019

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