In a graph that plots prey population (Nprey) on the x-axis against the number of predator offspring produced per unit of time on the y-axis, the slope represents the
A) efficiency of predation (c).
B) efficiency with which food is converted into predator population growth or reproduction (b).
C) predator population growth rate (r).
D) the rate of increase in prey availability.
B
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Curved, microaerophilic, gram-negative rods, with most species having strong urease activity and the majority of which colonize mammalian stomachs or intestines, describe which group of bacteria?
a. Campylobacter b. Helicobacter c. Arcobacter d. Enterobacter
The potential seventh mass extinction refers to ____
a. the loss of 50% of species on Earth, including dinosaurs, at the end of the Cretaceous b. the most extensive loss of species that occurred during the Permian c. what will happen to the human species if a nuclear war occurs d. the rapid loss of biodiversity due to human degradation of the environment e. events that occurred just before insects diversified on land
In which direction do the replication forks move in prokaryotic DNA replication?
a. 3’-5’ b. 5’-3’ c. both directions d. the replication forks do not move
Why is it so difficult to control or eradicate invasive species?
A. Common herbicides will not kill invasive species. B. Removing invasive species manually is time-consuming and difficult. C. Introducing new predators or diseases can be done without affecting the other living organisms in the area. D. Drying them out or depriving them of oxygen can be done without affecting the other living organisms in the area. E. All of the above make it fairly easy to eradicate invasive species.