20. During the last Ice Age, glaciers covered much of the higher latitudes in North America. Considering the
factors that influence the diversity of a community,
which of the following is probably NOT true?
(a) At northern latitudes, large lakes contain more
fish species than small lakes.
(b) At northern latitudes, large lakes have larger pop-
ulations of each species than small lakes.
(c) At northern latitudes, large lakes have experi-
enced fewer species extinctions than small lakes.
(d) At northern latitudes, small lakes were colonized
by new species faster than large lakes.