Which of the following statements correctly traces the route of water through a sponge?
A. enters through the osculum into the spongocoel and exits via the ostia
B. enters through the spongocoel into the osculum and exits via the ostia
C. enters through the ostia into the osculum and exits via the spongocoel
D. enters through the ostia into the spongocoel and exits via the osculum
E. enters through the osculum into the ostia and exits via the spongocoel
D. enters through the ostia into the spongocoel and exits via the osculum
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The infectious stage of chlamydiae is called a(n) ________ body.
A. oogonial B. contagious C. elementary D. reticulate
The oxygen content of dry air in the atmosphere
A. varies depending on the altitude. B. is about 21.0%. C. is inversely proportional to the partial pressure of oxygen. D. is about 0.03%. E. is about 78.1%.
Which bird is a social parasite and lays its eggs
in the nests of other birds? a. catbird b. cowbird c. magpie d. Kirtland warbler e. blue jay
If there are two alleles of a gene, B and b, and the frequency of the B allele (p) is 0.90, the frequency of the b allele (q) is
A) 0.81. B) 0.30. C) 0.10. D) 0.09. E) 0.01.