Zero population growth is achieved
a. when a population reaches the carrying capacity
of the environment.
b. when emigration and immigration are balanced,
and the number of births equals the number of
deaths.
c. anytime that births exceed deaths.
d. anytime that deaths exceed births.
e. when emigration and immigration are prevented.
Answer: b
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Coated vesicles known as ________ are thought to potentially be associated with cholesterol uptake and/or have a role in signal transduction.
Fill in the blank(s) with the appropriate word(s).
Classical conditioning and operant conditioning differ in that they apply, respectively, to ____ and ____ behavior
a. voluntary; involuntary b. involuntary; voluntary c. instinctive; learned d. learned; instinctive e. active; passive
Which of the following misconceptions about evolution can be refuted with the molecular evidence that is being collected through DNA analysis?
A. Evolution is not observable or testable, thus it is not science. B. Evolution proposes life changed as a result of random events; traits are too complex to have originated by chance alone. C. Evolution is a theory about how life originated. D. There are no transitional fossils.
One advantage of excretion of urea instead of uric acid is that urea
a. reguires less energy then uric acid to produce b. can be concentratred to a greater extent c. requires no water to excrete d. is a larger molecule