Sometimes cultural change can drive biological evolution
A. true
B. false
A
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What is the most recent common ancestor of fungi and animals?
A. A protist B. A bryophyte C. An algae D. A moss
The enzyme nitrogenase is most directly involved in the process called
a. nitrification. b. ammonification. c. nitrogen cycling. d. nitrogen fixation. e. nitrogen assimilation.
The crayfish has a cavity or "statocysts" lined with sensory setae or hairs. A grain in the cavity is pulled downward by gravity; the pressure against the bottom hairs of the cavity gives the crayfish a perception of being upright and, when it changes orientation, the grain touches side hairs that make it realize it is not upright. Thus the crayfish "knows" which way is up in the dark. This sense is most closely related in function to the human sense of
A. hearing. B. sight. C. smell. D. hot and cold. E. balance.
In principle, why are t-statistics and critical values not as useful in the practical construction of confidence intervals in most applications?
A. In large samples (i.e., large degrees of freedom) the t-distribution and standard normal distribution are very similar. B. Their use is only valid in small samples. C. Their use is only valid in large samples. D. They are not often found in most software applications.