A graph of "wolf kills vs. caribou density" rises rapidly and then flattens because ________
a. at higher prey densities, the predator cannot catch, eat, and digest the prey in a way that is proportional to prey density
b. the wolf switches to a different prey
c. it is a type I response
d. the number of hiding places for caribou decreases
a
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Even in the absence of transpiration, some water can move into the roots and partially up the xylem columns. This phenomenon is due to
A. root pressure. B. proton pumps. C. stomatal opening. D. flooding. E. phloem translocation.
Use the following study to answer the following question(s): A current trend among professional baseball players is to wear braided titanium necklaces. The titanium reportedly regulates the flow of energy through the body. The player wearing the necklace then shows improved strength, tires less, and recovers more quickly.Which of the following would be the strongest evidence for or against the necklace's effectiveness?
A. A bar graph illustrating the satisfaction levels of the players who wear the necklace B. A bar graph comparing batting averages of the players who wear the official titanium necklace and those who were unknowingly wearing a fake titanium necklace C. A bar graph comparing the percentage of players who wear the necklace with the percentage of players who do not wear the necklace D. A scatter plot showing days on the disabled list and percentage of players who do or do not wear the necklace
Human genetic diseases such a Cri-du-chat, Angelman syndrome and Prader-Willi syndrome are the result of which type of chromosomal change?
A. Translocations B. Duplications C. Deletions D. Inversions
The following paragraph describes the activities of hypothetical scientists. After reading this paragraph, list the steps of the scientific method, and list the activities that correspond to the steps of the scientific method.
A rancher noticed that several grazing animals had become sick after grazing in a new area. The rancher asked a team of scientists to analyze this problem. They visited the area and found that the food available to the animals was similar to the food they had been eating. The water supply in the area was adequate but limited to a single spring. Some of the scientists felt that the water might be contaminated with a pathogen. Therefore, they collected water samples from the spring in the new area and compared them with water samples taken from previous grazing sites. The scientists noticed that water from the new area was cloudier than water obtained from other areas. Culturing this water revealed that a pathogenic strain of bacteria was present. This bacterial strain was found to be identical to a strain obtained from sick animals. This strain was not present in healthy animals. They concluded that a contaminated water supply in the new area was responsible for the problem and instructed the rancher to avoid the water supply. The disease was not found in the rancher's livestock again.