a. The degrees of freedom used in this exercise was 6
b. SKIP c. The calculated chi-squared value is 40.06 d. No, our results indicate that there was another factor influencing the unequal numbers of capture. The probability decreases the higher the chi-squared value. e. The green worms were subjected to a positive selection pressure, because they blended in with the environment (grass). The red and blue worms were subjected to a negative selection pressure, because they stood out against the grass and were picked off faster. f. The results indicate that over time, the wooly worm population would lose the red and blue subspecies through natural selection and only have the green worms. g. The characteristics of the predator also affect the worm populations. If the predatory birds were different than humans, the lab might have gone differently. For example, if worms were unable to see color, the would have picked on the worms equally and color would not have been a factor in natural selection. If their vision was really good, more green worms would get picked off, but if their vision was awful, virtually no green worms would be eaten. Similarly, more green worms would be eaten by daytime feeders than nighttime feeders due to the same visibility issue. h. If our particular school environment remained unchanged over a long period of time, in ten years the population would consist of all green worms, because natural selection would eliminate the brightly colored worms.
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