Cope's rule, that animals tend to increase in size over evolutionary time, is a(n)
A. driven trend, because natural selection always favors larger animals.
B. active trend, because there is a persistent bias against smaller animals.
C. passive trend, because there is a minimum size under which animals cannot function, but increased variance in size moves the mean and maximum upward.
D. case of saltation, because increases in size occur by great jumps.
E. example of phylogenetic niche conservatism, because ecological niches favor the large.
Answer: C. passive trend, because there is a minimum size under which animals cannot function, but increased variance in size moves the mean and maximum upward.
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