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(You decide what to do with the “decayed nuclei,” or those with the marked side up.) 4. Using the pooled data, prepare a graph by plotting the number of radioactive “nuclei” on the y-axis and the number of tosses, which we will call half-lives, on the x-axis.2.

Continue this process until there are no radioactive “nuclei” left. How good is our assumption that half of our radioactive “nuclei” decay in each half-life?

Place your “nuclei” in a paper cup, cover and shake the cup. Separate the “nuclei” into two piles, one with the marked side up and the other with the marked side down. On your data table, record the number of “radioactive nuclei” candies with the marked side down.

Predict how many radioactive “nuclei” you will have after the next toss. Return only the radioactive “nuclei” to your paper cup.

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This lesson can be done in two, 45-minute class periods.Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.____________________________________________________________________________________5. ” If you could follow the fate of an individual atom in a sample of radioactive material, could you predict when it would decay? If you start with a 10-gram sample of strontium-90, how much will be left after 115.2 years? Explain.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________8. Justify your answer.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________9. The location and tracks were discovered by archaeologist Mary Leakey in 1976, and were excavated by 1978.Based on analysis of the footfall impressions "The Laetoli Footprints" provided convincing evidence for the theory of bipedalism in Pliocene hominins and received significant recognition by scientists and the public.The age of the fossil must be determined so it can be compared to other fossil species from the same time period.Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms. (Radioactive nuclei will be those candies with the marked side down.) 2. Write that number in the data table under the heading “Number of Radioactive Nuclei.” In the column marked “Prediction for Next Toss” write the number of radioactive nuclei you think you will have with your next toss.These changes typically occur so slowly that they are barely detectable over the span of a human life, yet even at this instant, the Earth's surface is moving and changing.As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.




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