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It is a great introduction to the scientific process of deducing, forming scientific theories, and communicating with peers.

It is also useful in the mathematics classroom by the process of graphing the data.

Now it is time to put those math skills to good use.

At one half-life, you would have approximately 50% Carbon-14 and 50% Nitrogen-14.

Isotopes have the same chemical properties, but different physical properties.

An example of isotopes is carbon, which has three main isotopes, carbon-12, carbon-13 and carbon-14.

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However, your readout from your radioactivity measuring instrument says you have only 25% Carbon-14 and 75% Nitrogen-14, so your fossil must have been through more than one half-life.

This experiment is best used by student working in pairs.

Grade Level: 5-12 grade Disciplinary Core Ideas (DCI) 3-5ETS1-2, MS-ESS1-4, HS-ESS1-6 Time for Teacher Preparation 40-60 minutes – To gather materials Activity Time: 40-60 minutes (1 Class Period) Materials: Objectives Students try to model radioactive decay by using the scientific thought process of creating a hypothesis, then testing it through inference.

Perhaps the most widely used evidence for the theory of evolution through natural selection is the fossil record.

The fossil record may be incomplete and may never fully completed, but there are still many clues to evolution and how it happens within the fossil record.

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