13. Which of the following statements is correct? A. Population size of predators increases when their prey's population is low. B. Competition for resources is density-independent when food is plentiful. C. Disease is density-dependent because spreading occurs more easily when a population is closer together. D. A change in average temperature is a density-dependent factor because fewer organisms can acclimate to variations in temperature.

1.  The best example of a population in the list below is the     a tiger salamander tadpoles in 2006. b nvertebrates in Elk Island National Park in June 2005. c Canadian darner dragonflies in Kerry Wood Nature Reserve on June 21, 2005.

Which of the following is the best evidence that a mutualism is NOT a byproduct mutualism? Group of answer choices A. Each partner changes the help they give based on the amount of help from the other B. Each partner benefits from the relationship C. Each partner is a member of a different species D. The observed partners are nonkin E. The observed partners are kin

5. Zebra mussels are an aquatic invasive species that are threatening the diversity and abundance of native species in the lake ecosystems of Alberta. Sylvan Lake is a beautiful recreational lake located in central Alberta. It has a total area of 43 km?. If the population of zebra mussels is estimated to be 128 mussels/200 km?, calculate the size of the zebra mussel population in Sylvan Lake. Show all work. Express your answer as a value rounded to one decimal place:

10: according to both diagrams the extinction of which one of the spider species would likely have a much bigger impact on community structure than the extinction of any of the others? A. Spider A B. Spider B C. Spider C D. It is not possible to predict

3. In 1940 there were 12 whooping cranes in the population. In 1945, five years after hunting whooping cranes was made illegal, ecologists calculated the whooping crane population growth rate (X) at 1.2 and estimated the population size to be 30 individuals. Using the population growth rate calculated from 1940-1945, what would be the estimated population size for whooping cranes 20 years into the future (1965)? BIO 316 Study Topics and Practice problems for Exam 2 Please bring your own calculators. Be sure to show all work in order to get partial and full credit. 4. Calculate the Net Reproductive Rate, Mean Generation time, and intrinsic rate of increase using the fecundity table below for the Galapagos cactus finch: Age class lx mx lxmx 0 1 0 1 0.512 0.364 2 0.279 0.187 3 0.279 1.438 4 0.209 0.833 10 567890 0.209 0.5 0.209 0.833 0.209 0.25 0.209 3.333 0.139 0.125 0.07 0 11 0.07 0 12 0.07 3.5 13 0 xlxmx 3

4. Identify the time interval during which each of the following occurred: the population grew (graph is rising) from week the population grew the fastest (graph is steepest) from week the population size remained the same (graph is horizontal) from week week the population decreased (graph is falling) from week 5. Predict the number of beetles present at the following weeks: week 5 - week 9 - beetles 6. Could this data be presented as a bar graph ? What would be the disadvantage ? to week 8. Design a simple experiment to test this hypothesis. 11 to week 7. Construct a hypothesis to explain why the beetle population declines. to week beetles to

Part A)  A biologist notices that the same species of Tortoise exists in Texas and Mexico.Yet these tortoises have somewhat different life histories. This is probably due to the diverse array of__that each tortoise has with different components its own environment.a. interactionsb. conversationsc. adaptationsd. all of thesePartB.). If water amounts and food production capabilities decrease, what can happen to carrying capacity?a. increase b. decreasePart C. Alabama should be a desert but it is a lush green environment. What keeps us from being so dry?a. Hadley Cellsb. Ocean Gyresc. Mountainsd. all of the above