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. Postlab Questions
Positive feedback loop about the melting of glaciers. Negative feedback loop about rainfall. Negative feedback loop about the eruption of volcanoes.
Droughts in the U.S.
This is an average temperature of the U.S. in January 2017. It's disappointing because our area only shows a little less than a 50 degree average, which isn't that cold. This is an average precipitation in the U.S. in July 2017. As per usual, California has zero rain in the summer. It's surprising that Florida gets that much rain in July, and pretty much nowhere else. This is the probability of severe weather in the U.S. on September 1st. The probability in Texas and Florida isn't that high, which should now probably be updated based on the recent hurricanes. This is a weather outlook for the U.S. in September 2017. Of course, for the west coast it's predicted to be warmer than normal, which is not fun for us. The opposite side of the country, on the other hand, is predicted to be colder than normal. And then there's Florida.
The population of Turlock, CA is expanding slowly. This may be due to the growing commercial industry bringing more jobs to the area.
The population of Bellevue, WA is declining. This may be due to movement into the nearby larger city of Seattle.
The population of Freeland, WA is declining. This may be due to the fact that Freeland is on an island, and less people want to live on an island as times change and it is more beneficial to live on the mainland.
The population of Boise, ID is stable. However, there is a jump in the population with people ages 20-29 due to nearby colleges.
The population of Coupeville, WA is declining. This may be due to the fact that Coupeville is on an island, similar to Freeland (above), and less people want to live on an island as times change and it is more beneficial to live on the mainland.
The population of Gillette, WY is stable, bordering on slightly declining. This may be due to the stagnant nature of the state of Wyoming's population as a whole.
The population of Martin, SD is slowly expanding. This may be due to the recent increase in efforts to promote better healthcare and education in poorer areas of South Dakota such as Martin.
The population of San Diego, CA is declining. This may be due to movement out of the city and into surrounding suburbs such as Encinitas, Del Mar, Rancho Santa Fe and La Jolla.
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