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Change in the frequency of alleles over time within a population. Biological evolution is change in organisms over time. It includes the small fluctuations in the population and the genetic makeup of a population as it changes. Horn size is a heritable trait rams with large horns will have offspring that have long horns. Since trophy hunting selectively eliminates rams with large horns, it favors rams whose genetic characteristics lead to the production of small horns. So trophy hunting is causin the genetic change over time. Descent with modification not only do descendants have modification they are very similar to their ancestors but they are also different in a relatively small number of ways. When this occurs, both descent and modification can be observed. The way the sediment was laid below the lake date them very clearly based on depth in the rock.

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