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Help me please! Biology! please! 10 points!? [Copy this link to quote]

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Post time: 2012-07-19 16:04:57
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. How does radiometric dating help scientists pinpoint the age of a fossil?  (Points : 3)
       In radiometric dating, scientists use the rate of decay of radioactive materials in rocks to estimate the absolute age of a rock. That tells them the age of fossils found in that rock.
       Radiometric dating allows scientists to find fossils in only the lowest and oldest layers of sediment.
       In radiometric dating, scientists place samples of a fossil in certain liquids until the samples dissolve. The rate at which they dissolve indicates the age of the fossil.
       In radiometric dating, scientists mix the carbon in a fossil with carbon from similar fossils whose age they know. By comparing, the carbon they can tell the exact age of the fossil.

15. Which of the following is a significant benefit of studying fossils? (Points : 3)
       Fossils help prove that organisms of the past have little relation to present-day organisms.
       Fossil evidence shows that changes that occurred in the past no longer occur.
       Fossils give information about the colors and outer coverings of organisms that are no longer living.
       Fossils give information about the time periods in which organisms lived in the past.

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Post time: 2012-07-19 16:13:57
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Help me please! Biology! please! 10 points!?

In radiometric dating, scientists use the rate of decay of radioactive materials in rocks to estimate the absolute age of a rock. That tells them the age of fossils found in that rock.

Fossils give information about the time periods in which organisms lived in the past.

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