Chapter 1: A Universe of Life
A) 6000 years. B) younger than 5 million years. C) between 5 and 10 million years old. D) older than 10 million years. E) we can tell nothing about the fossil’s age from this data. 55. The Earth’s geological time scale is divided into four main. A) epochs . B) periods. C) eras . D) eons . E) ages . 56. ................
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