An ecologist hypothesizes that predation by a particular owl species is the major factor controlling the population of a particular rabbit species. The first step in testing this hypothesis would be to determine
A) whether populations of the rabbit that live outside the range of the owl have higher population densities.
B) whether the owls eat the rabbits.
C) to which diseases the rabbit population is subject.
D) what food the rabbits eat.
Answer: B
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A woman goes to the doctor and is diagnosed as having rheumatoid arthritis. What factors led to her development of this disease? Select all correct choices
A. Some of her T cells were not positively selected. B. Some of her T cells were not negatively selected. C. Some of her T cells are recognizing and responding to her normal self antigens. D. Some of her T cells are not recognizing and associating with her MHC proteins.
Chaparral is
A. a type of shrubland/grassland. B. a type of forest. C. restricted to serpentine soils. D. widespread in Africa. E. distinguished by tall trees.
What is the primary means of reproduction among the protists, cnidaria, and tunicates?
A. asexual reproduction B. sexual reproduction C. asynchronous reproduction D. hermaphroditic reproduction
Why do some Basidiomycetes form a ring like organization, as observed on the top of soil?
a. They deplete the soil of magnesium. b. They deplete the soil of oxygen. c. They deplete the soil of nitrogen. d. They deplete the soil of potassium.