Which are the animals with a crown of cilia that look like a spinning wheel?
a. rotifers.
b. phoronids.
c. bryozoans.
d. ctenophores.
e. platyhelminthes
a
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The theory of island biogeography describes the number of species on an island as being determined by an equilibrium between the processes of immigration and extinction. Consider a small, far-offshore island and a large, near-shore island
Which island is expected to have a higher equilibrium number of species? A. far off-shore, small island B. near-shore, large island C. The equilibrium number of species is expected to be the same. D. It is not possible to make a definite prediction based on the information given.
The Centers for Disease Control estimate that ________ of all hospital patients acquire some type of health-care-associated infection.
A. about 1 percent B. about 5 percent C. about 50 percent D. about 20 percent
d. because geographic isolation has occurred
a. because individual organisms cannot evolve; only populations can b. because natural selection does not act on individuals c. because an organism’s environment does not change during its lifetime d. because the environment plays no role in evolution
Does the permeability of the membrane to water affect the equilibrium flowin-flowout value?
a. Yes b. No