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Taxonomy and Evolution Report

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| Taxonomy & Evolution Report | Fossils | Biology 1107 | Jennifer | 2/5/2015 |

Jennifer Vira
Biology 1107
11 February 2015

While exploring a rural region of china that had yet to be explored, we took soil samples and determined that the area we were in was once a desert. Over time it became a tropical rainforest. It then was cut down for farmland fifty years ago. While digging around we found sixteen mammalian skeletons that were closely related. We examined the humerus and femur bones to determine how many species there is and during what time they were around. I expect there to be around three different species with the similar femur to humerus ratio being from the desert and ones with longer femurs to be from the rainforest. We measured the lengths of the femurs and humerus in centimeters. Then we made a table with all fifteen individuals’ femurs and humerus lengths plus a table with the ratio of femurs lengths to humerus lengths. We found the average standard deviation of these measurements and made scatter plot showing humerus length against femur length and a bar graph to represent the femur to humerus length ratios of the species. Lastly carbon dating on five individual skeletons was done to show which species lived during the times between the land was a desert and a rainforest. The table below shows the measurements of the individual skeletons humerus and femur length with the average and standard deviation at the bottom. The scatter plot of this table shown next to the first table shows there are 3 distinct groups meaning there are 3 different species. The second table shows the ratio between femur length to humerus length with the average and standard deviation at the bottom and the bar graph next to the second table represents this data of the table. The carbon dating of the five individual skeletons shows that individuals seven and twelve were the oldest fossils and were around the dessert time and individuals fourteen and eight were around the time of the rainforest. While individual four was during the transition of the region from desert to rainforest.

The results supported my hypothesis and predictions that there would be three species grouped by the relation of their humerus and femur and that the species with the longer femur to humerus would be from the rainforest and that the more equal they were would be from the desert. Also the ones in transition would have the similar humerus length as the ones from the desert but have longer femurs. The change of the environment caused the species to adapt and evolve. A species may evolve to a new species if the original parent species got separated somehow like with a geographical border where they can’t reach each other. Over time they will start to evolve and won’t be the same anymore this might be why the species here are different.

Works Cited
"Rise of Mammals Article, Mammal Evolution Information, Facts -- National Geographic." National Geographic. Web. 11 Feb. 2015.
Wang, Xiaoming, Lawrence Flynn, and Mikael Fortelius. "Fossil Mammals of Asia." Google Books. Web. 12 Feb. 2015.
"Fossils Show Earliest Mammals That Lived in Trees and below Ground - CNN.com." CNN. Cable News Network. Web. 12 Feb. 2015.
Monroe, James, Reed Wicander, and Richard Hazlett. "Physical Geology: Exploring the Earth." Google Books. Web. 13 Feb. 2015.

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