On a rocky reef, a sea urchin population follows logistic gr…
On a rocky reef, a sea urchin population follows logistic growth, with per-capita growth rate of 0.4 and a carrying capacity 2000 individuals. A) If the current population is N0 = 400, compute the number of new individuals added in the next year and the projected population size at N1. (A full credit answer will show any calculations) (6 pts) B) Managers compare three possible urchin abundances after a cull: N = 200, N = 900, or N = 1600. At which abundance will the population add the most individuals next year under the logistic model? Briefly justify your choice. (2 pts)
Read DetailsBuilding on the Habronattus pyrrithrix jumping spider study,…
Building on the Habronattus pyrrithrix jumping spider study, researchers now hypothesize that leg color intensity affects male survival by reducing predation, rather than influencing mating success. They design two treatments: Group 1: Males with leg color darkened using non-toxic paint. Group 2: Control males treated with a clear paint of the same chemical base. Spiders are then released into outdoor enclosures containing both females and predators. A) Write the prediction being tested in this experiment. Identify both the predictor and response variables. (3 pts) Prediction: Predictor variable: Response variable: B) The paint used to darken legs can change heat absorption and thus body temperature, which could influence survival for reasons unrelated to predation. In one sentence, describe one practical way to control for the temperature effect in the study design. (1 pt)
Read DetailsPotassium bromide, KBr, crystallizes like NaCl in a face-cen…
Potassium bromide, KBr, crystallizes like NaCl in a face-centered lattice. The ionic radii of K+ and Br– ions are 133 pm and 195 pm, respectively. Assuming that all Br– ions are positioned in the face and corners of the unit cell, while the K+ ions are positioned along the edge alternating between anions, calculate the length of a unit cell edge.
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