ENVS 200 - Chapter 9 TOP A+ EXAM QUESTIONS & ANSWERS 2024

1. You have researched outbreaks of West Nile virus. You see a pattern whereby the numbers of incidences of outbreaks increases ten days after a period of precipitation in which daily temperature is below 20 degrees Celsius, soil moisture is between 50% to 65%, and relative humidity is above 60% over a continuous period of 5 days. What can you conclude from these data? a. You can conclude that these environmental factors are why West Nile virus outbreaks increase. b. You can conclude that these environmental factors are correlated with an increase in the number of West Nile virus outbreaks. c. You can conclude that these environmental variables are correlated with an increase in the number of west nile virus outbreaks and prove the causal relationship. d. You can conclude that west nile virus is not affected by abiotic variables. - B 2. In 1944, a researcher observes 710 ithomiine butterflies in a lek in a Central American rainforest. In 1945, 1946, and 1947, the same researcher observed 722, 711, 744, and 702 individuals in a lek at the same location. In 2012, a different researcher revisited the same location and observed 694 ithomiine butterflies in the lek. What can you say about the stability of these ithomiine butterflies? a. Nothing has really changed from 1944 to 2012. b. The population has not fluctuated through time. c. The population has experienced a steady decline. d. None of the above. - D 3. You have studied a population of birds over a three year period. You want to learn how this population experiences mortality at each phase of the life cycle. What analysis could you use to do this? a. A k-value analysis b. A meta-analysis c. A structure analysis