How does the geologic time scale help geologists study Earth’s time divisions?

Scientists use the geologic time scale to illustrate the order in which events on Earth have happened. The geologic time scale was developed after scientists observed changes in the fossils going from oldest to youngest sedimentary rocks.

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in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

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