Theory of Evolution 0.0 / 5 ? BiologyLife on EarthGCSEOCR Created by: rstaines98Created on: 05-01-14 18:22 How old is Earth? 4.5 Billion Years Old 1 of 5 How long has life existed on Earth? 3.5 Billion Years 2 of 5 What was Darwin's Theory based on? That all of life started one bacteria 3 of 5 Which animal is used the most for selective breeding? Dogs 4 of 5 What are some causes from mutations that occur in genes? Background radiation and chemicals 5 of 5
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