For how long has there been life on Earth? For what percentage of time has life existed on Earth? For about how many years of geological time have human existed on earth?
For how long has there been life on Earth? For what percentage of time has life existed on Earth? For about how many years of geological time have human existed on earth?
Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN:9781337408332
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Chapter25: Animal Evolution-the Chordates
Section: Chapter Questions
Problem 4CT
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For how long has there been life on Earth? For what percentage of time has life existed on Earth? For about how many years of geological time have human existed on earth?
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