The copulatory organ of the earthworm is the
a. penis.
b. clitellum.
c. gonopodium.
d. vestibule.
d
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Lake Victoria is famous for its variety of cichlid fishes. In fact, they offer the most diverse assembly of vertebrates presently known to science. One trait that scientists have focused on as one possible reason for their adaptability is
A. a second set of scales that lie beneath the top outermost scales. B. a second set of jaws in their throats. C. gill arches that are not covered by an operculum, which prevents hiding places for gill parasites. D. digestive tracts that are able to process most substrates, which has eliminated the need for feeding specialization. E. ability to change color in relationship to their environment.
In the light-independent reactions of photosynthesis, CO2 is added to a five-carbon molecule known as
A. cellulose. B. CAM. C. ribose. D. RuBP. E. deoxyribose.
Most of the diseases caused by the members of the family Rickettsiaceae require a vector for the transmission of the diseases. Which of the following diseases does not require an arthropod vector?
A. Q Fever B. Rocky Mountain Spotted Fever C. Ehrlichiosis D. Epidemic Typus E. Endemic Typhus
Which of the following statements regarding ferns is true?
A) Ferns are most diverse in grassland environments. B) Ferns have well-developed roots and rigid stems. C) Ferns produce seeds that are dispersed by water. D) Ferns produce pollen that is dispersed by air.