dating the fossil record answers

In each element, the number of protons is constant while the number of neutrons and electrons can vary. Organisms like pigs and rodents are more typically used because they are more common, widely distributed, and evolve relatively rapidly. You have authorized LearnCasting of your reading list in Scitable. The abundances of parent and daughter isotopes in a sample can be measured and used to determine their age. Now that the physical reality of this local rock column has been established, we must conclude that the fossils contained in these rock layers are also a valid record of the order that creatures were progressively buried within each successive sedimentary layer. Numerical ages estimate the date of a geological event and can sometimes reveal quite precisely when a fossil species existed in time. This change is called radioactive decay.

DATING THE FOSSIL RECORD ANSWERS / janiceclark.net

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