Radioactive dating math problems
Remember, the less parent element remains, the older the rock is!
If each half-life is 10 million years, then 3 x 10 million = 30 million years old. C the other options support evolution in general, but do not relate to bacteria specifically, and so are not the BEST.
After 3, there is half of 25% = 12.5%, and after 4 half-lives there is half of 12.5% = 6.25% of the original material remaining.
For example, say a fossil is found that has 35% carbon 14 compared to the living sample. We can use a formula for carbon 14 dating to find the answer.