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102

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Electrical Engineering

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Feb 20, 2024

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Conner Bailey Professor Shang BIOL102L-008 15 March 2022 The question I aimed at answering pertained to whether or not the growth rate of grass had an effect on the size of rabbit populations. I could have gone in the direction of manipulating the weed population but felt that examining changes in the amount of food availability seemed best fitting as the lab report I recently just wrote was related to how evolution connects with organisms’ ability to gather food. In my investigation I had the ability to manipulate four aspects of the rabbit system. These aspects were grass growth rate, grass energy level, weed growth rate, and weed energy level. I chose to only manipulate the grass growth rate, making that my independent variable. I left the values of the remaining three variables at the same level during the entirety of the experiment, making them constants. The dependent variable, what I wanted to observe, was the number of rabbits present in the population at the end of each trial. I began the simulation with all variables at a level of 5 and ran the simulation for a total of 30 seconds by using the timer on my phone. I recorded the number of rabbits present at the end of the 3-0 second and placed this value in a Microsoft Excel sheet. I then repeated this same process but adjusted the grass growth rate to levels of 10, 15, and 20. The results were compiled into a table using Microsoft Word, and graphs were created for each trial from the NetLogo simulation. I conducted my experiment in this manner to observe if an increase in growth rate of food would tie

directly into an increase in the size of the rabbit population. I also wanted to examine if there was a carrying capacity of this system, a point where the environment would no longer be able to provide adequately for the number of rabbits present. It was hypothesized that ff the grass growth rate is increased in the simulation, then the rabbit count will be the highest at a growth rate of 20. The null hypothesis for this experiment was If the grass growth rate is increased, then there will be no chance in the rabbit count. In my findings, as the grass growth rate increased, the size of the rabbit population increased as well. With this evidence, I am able to reject the null hypothesis and say that the data supports the alternate hypothesis. These results reveal that ore grass will allow for the development of more rabbits. An increased amount of food resources allows for more energy expenditure and aids in rabbit survival which in turn will lead to more rabbit offspring. It is unknown when the system will reach its carrying capacity, or if the simulation even entails one as the trial were only run for 30 seconds. Table 1 Grass Growth Rate Level Number of Rabits 5 170 10 244 15 304 20 374

Graph 1. Growth Rate Level 10

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