The _____ is a thin membrane which, if present, partially covers the vaginal opening.
A. mons pubis
B. perineum
C. clitoris
D. hymen
D. hymen
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Which of the following best explains the figure?
A) Conspicuous behavior leads to high infection intensity. B) High intensity infection leads to more conspicuous behavior. C) There is no relationship between conspicuous behavior and infection intensity. D) Only infected individuals exhibit conspicuous behavior.
The type of selection most likely to act on a well-adapted population in a relatively constant environment is
A) directional. B) artificial. C) stabilizing. D) nonrandom. E) disruptive.
Public health scientists discover and become concerned about a new strain of RNA virus among farm animals, especially geese and pigs, in the Midwest. Each virion is composed of lipid, helical proteins, and multiple pieces of RNA. This new virus may be a(n)
A) rotavirus. B) influenza virus. C) hantavirus. D) dengue virus. E) coronavirus.
How do protists provide evidence for the step-wise evolution of mitosis?
A. Mitosis has not been observed in any protist species. B. Only meiosis occurs in protists. C. Protists use conjugation instead of mitosis. D. In some protists the nuclear membrane fails to breakdown during mitosis.